Malicious PDF — malware analysis report

Static analysis result for SHA-256 b31e9b20cc0dd311…

MALICIOUS

PDF

68.9 KB Created: 2021-10-02 13:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9bdde079a65a6a8892851b6e75c64f6e SHA-1: 0bfca38d5d087b5e220da20e64533fb47a967ecd SHA-256: b31e9b20cc0dd311d8bb0f12f235068b8fdb6cf538798b7a992a01c245184834
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the structure and URL patterns align with common PDF-based phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://kawanmto.org/contents/files/20796855698.pdf In PDF document text
    • https://usgcambodia.com/userfiles/file/nejiroj.pdfIn PDF document text
    • https://tsegypt.com/file/91494974392.pdfIn PDF document text
    • http://104450wp19.agentcentrum.com/userfiles/files/55931960692.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/946218986dfcc22559cea22f26d29de1/juzufe.pdfIn PDF document text
    • https://edftrans.serwiskonsularny.pl/images_user/file/64019307148.pdfIn PDF document text
    • http://vhz.cz/user-files/19740233612.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/sidojavomogu.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/80722058149.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/9abd9088cdda790ba5498096a526b088/nabif.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/gedujomapo.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/40266867772.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/54236051978.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/41208355389.pdfIn PDF document text
    • http://freewest.at/xupumelelag.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/wedorojupezuka.pdfIn PDF document text
    • https://avistravel.activsport.ro/userfiles/file/23397877039.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/68446989612.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/abd6b13883a9ef281f55623637dfc516/wexamudufujalu.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/13857607150.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/86277323757.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/14774114662.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/zuloratumodixamuwiza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=volume+of+prisms+and+cylinders+formulaPDF 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_off0000b043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85A 10868 bytes
SHA-256: ad51255697a1fbc3ada117e9f390f4e31e5e48d5a6060d02ac8d034959df560b
font_02_sfnt_off0000e16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 14524 bytes
SHA-256: 590ac91ceb15ab7cf8829723b9982357432b2f08f7fd33dddc1f383c8788258f

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