Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a23b48c960c107…

MALICIOUS

PDF

92.8 KB Created: 2021-07-19 17:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d613e5d4c7604cc8e4ca0dda55adbc21 SHA-1: eb6c3b5c73f8880e01f26e5569abec74ba75bed8 SHA-256: e3a23b48c960c107080c6397f150684516dbf201a28997a203ed5468f9e74915
264 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Installation

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The document contains lures for disabling security software and a password-protected archive, suggesting it is designed to bypass security controls and deliver a payload. It also includes callback phishing elements, indicating a potential social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607329d8c81c4---xonukasewazuderijog.pdf In PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609daee18064f---84808451249.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/f9a151ac1270ba54331c677b04a350ee/nasojomazexalar.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/rizogidukajunujolu.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/jonazigefurura.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/4a12731d33d8270446f4c015ba50fa4b/69793615573.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/028a075b674ac066fdbcb173f81c0c9d/kosadomuzawemo.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/523a40e0ac6374f90be1bd18461041e7/rifuminipe.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7144847c51---mupazuvujuv.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0dc1fb37e9---ratunirasinexen.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e63a88888758440e4a26fdba06f07e6f/dadejenizebitunemipererom.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075ea4b63809---wezevupuk.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/jitujokejuzami.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/72588324667.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/zelebefojil.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074f81b2da1c---11914167349.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/14b9sc4da451emr5tmjas7nss2/totixitasaxu.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/6e12275f372fca65a4d6d16c11d9a085/rogixofejeninonapomipapaj.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/tubaleragolatonarun.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/7374770176.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/f984f158cc8fb35271dc77eca781f6d1/43789088291.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/20866096125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=easy+samsung+frp+tool+2020+v1+free+download+for+pcPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 11516 bytes
SHA-256: 7af6f9eea49973bb715d5648455d8ba1e6e0afc6a53d0c9336da66ad6dbfc163
font_01_sfnt_off00010771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10771 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F83 17824 bytes
SHA-256: 6639ae9102297abd1e02b0b61e2540ebd08c1393fd901d1cc054c048de72a477
font_03_sfnt_off00014eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB2 16428 bytes
SHA-256: 23191a20989a09959b2cbcbcedb805b598ca26499a9d836ac043174a76a4ddba