Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3088f962a01257…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 22:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8fc2b500d47139301d6e15286f7f9619 SHA-1: f23ce7de39180c04e7f48598c5400711419401af SHA-256: 5d3088f962a01257a86bf4266a7e570fd2022b62e364dc9a7cc7e49b8dc9648e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious intent, including a ML classifier flagging it as malicious and ClamAV detecting it as a phishing trojan. The document body, though truncated, suggests a deceptive workflow with a download button and instructions to disable security software. The presence of numerous external URLs, many pointing to compromised or disposable hosting, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=fnaf+vr+free+download+android PDF link annotation
    • http://akvatoria.by/UserFiles/files/bovulipu.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/50402650881.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/2812956361.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/66272528714.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/fafakokokagalewopevize.pdfIn PDF document text
    • http://retailcop.ca/files/26552664174.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/nosiritowibewibow.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/ruwiguwapapev.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/dexokizasajejodizenu.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/nuxorigozirodamukedod.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/fed26c0e3edcc552e662a1719f47fefb/66296073762.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/25554753337.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614188a45f169---xudasixeponasuzut.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/ragor.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/77850618434.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/fomifisapalolu.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/femowinejasukal.pdfIn PDF document text
    • http://i-physiology.ru/upload/20502485945.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/66616788111.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/dacf4bf3915d1d0ae8c79dbd02f002ea/16295614566.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/gedaxezanutozaped.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/3071237608.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f02c54cc4d---67777364399.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/mapenexemizali.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/tuwovidasiwijiwina.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE19 18312 bytes
SHA-256: 06f970bf1d71911c345dd31d39ce7fb8d16a9680a5c8d82eb910a64bbe38594d
font_01_sfnt_off00010dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDE 10212 bytes
SHA-256: 942ea6e6726baeb9bba74c1e2dcd0f96c8ae73d0f453d548bd41fab61de3d7fd
font_02_sfnt_off000124da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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