Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b78c5dc37adbdfe…

MALICIOUS

PDF

118.9 KB Created: 2021-09-15 13:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c30d5302fdda807cde8977b80baf64fa SHA-1: 93992d9e13d78e0873afcdea8783e1972f335257 SHA-256: 9b78c5dc37adbdfe73426888d2dc62fe559210fa1244907b189aae109c67b1a9
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm of disposable URLs, suggesting an attempt to redirect users to malicious sites. The presence of a callback lure indicates a potential tech-support scam or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://levakov132.ru/userfiles/file/xemumolamozavevidit.pdf In PDF document text
    • https://signatureshreyas.in/userfiles/file/83761343086.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/lunikumevagudaxu.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///surakaxabudufonuja.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/gakarobige.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/benatagi.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7af07af4---jubagudivulowak.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/cmbtqsa50c4q157n5vmafbjm4s/7123580089.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/xojojimegetorixujudavum.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/pirelalisutevidesi.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/kapawugeraf.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/toporezutanumiv.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/19501004768.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/resotevutixip.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/pusimamafapotiw.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/12203890946.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613504f015a1f---95389150009.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133c374cf645---nurotijemovigi.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f7d9843aa---85605975562.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/volemagogiregokasujokamej.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/litosawe.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/labomasum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=graphic+mod+for+minecraft+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C90 10712 bytes
SHA-256: 7a7acfc412db1de2c1a6e85f74764661f2bd7abd36a13709c38ef134a2320ef1
font_01_sfnt_off000184fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D10 18532 bytes
SHA-256: abb8ea5ca74637a80f804f82e6c76d4f29f3dd8b36273c24c96505f56db9db6e

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