Malicious PDF — malware analysis report

Static analysis result for SHA-256 4665f51fd29b7729…

MALICIOUS

PDF

86.3 KB Created: 2021-07-23 09:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 533b35ff8a19ff4ed184c00b3051e68d SHA-1: 8cd8ba411965abcbcf7aa05da85a588b9c076d11 SHA-256: 4665f51fd29b7729398d97bce170d44d44c3e386496032d04626d038e06a6d4c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document's purpose is to trick users into downloading a password-protected file, a common evasion technique. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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.
  • 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://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/p5mbajlv68o9j62borl2nq96e0/29747692838.pdf In PDF document text
    • http://cosyromania.com/media/file/mejiridugefemaxutu.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/getokezawixiw.pdfIn PDF document text
    • http://charivne.info/images/file/davera.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/fudatin.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/22103390816.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16071f90a69ae2---jibuxusasatakub.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/37683359817.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/87241bff9d35aa1362378544a360784b/53901022449.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/67431817800.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/xagusasomelarelojel.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/tiritapoxubonokile.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9b2ccb0e9---toketerora.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087bf541b9d7---gulenovonovewiwefejisox.pdfIn PDF document text
    • https://digireg.cz/upload/18935578559.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/28462147560.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f63286e91b---zesemumorinibag.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/mudoraxikirenovoxa.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/tuferaduninazezolokilided.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/miwefulapapezosuwetubu.pdfIn PDF document text
    • http://firegallery.ru/img/upload/sinananewupitevagim.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946a82ef07e---46643250615.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/17c6ee690e0a9510d8c460237989eb9e/32399128129.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/58141224317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+turn+on+keyboard+light+macbook+airPDF 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_off0000ea44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 17752 bytes
SHA-256: be4c00b2867552f235ab0ecbce439959fc360679dd99cf40ebcfc06e55efaf19
font_02_sfnt_off000130c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C2 11172 bytes
SHA-256: 4fbf830182abe2315fb2b0692fb3ea469b01b0c000e9c8cad1691f24b0ce4667

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