Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5d9c4becef0992…

MALICIOUS

PDF

88.3 KB Created: 2021-08-08 12:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f67091fd76ed3be6e210ffdb846cc90f SHA-1: 4777e8b7e52cee220f66ec73467015c7a35437ec SHA-256: df5d9c4becef0992b33720998eba7a3cdecbdef51fc3fba01aaf2cc6caf17723
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malware. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security scans. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=winrar+full+mod+apk PDF link annotation
    • http://southfieldhigh.com/clients/a/a2/a202dccd336a30abee2d0a4364b9f07c/File/tumugevurupexosuxozenezew.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/18ae6841dd6325b33525b862f7d2a220/sozemobuwagaxujos.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/23353886151.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/62662927014.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c682867eb0e---39802415124.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/3952f33e6998b57778c94d7f003f7fa2/tilubefopajo.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/xeragovulufuboviwaj.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/sinunikafumig.pdfIn PDF document text
    • https://armenia4d.com/contents//files/16012399455.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/xatajamadowikuvomunamo.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8fe54b0a0---79393655818.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/valinefirasevubudamowozuz.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c26dcd88e5d---19034624167.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///76237623905.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/68006691059.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/p9membrfnghf0dsiru1ohp0b37/bazixukepojiwujofuvata.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/33713035635.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/8de89768f020b43ab3b5045efc790ffa/pejekizeseduzot.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/10271832263.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a45f502a2b9---wepilon.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/74988844239.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/95565536109.pdfIn PDF document text
    • http://proxima-design.cz/files/file/58135183994.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf897e3343---87757990948.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_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 10444 bytes
SHA-256: 695334b07f97447c3d687e7394c0b137f88e15e8000fce1cad058689cfa91407
font_01_sfnt_off00010c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12458 17884 bytes
SHA-256: 76abd65ba81bf5257f78e4cafbd608c107e4186ca3129d0b2a0edfdef3c8da6e

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