Malicious PDF — malware analysis report

Static analysis result for SHA-256 f506cb3b1ae50337…

MALICIOUS

PDF

96.5 KB Created: 2021-08-02 17:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5f9bb7122c1a11b26ed519f7a869d432 SHA-1: e03d9a48701282d79e0ab476f817328c9bbad1e3 SHA-256: f506cb3b1ae50337e06d2b877aac7fd194abfd99f47dba43d3c530ea2a6a5d15
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links, and the presence of external URIs further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://cructi.ru/uplcv?utm_term=advanced+english+grammar+book+for+class+11-12 PDF link annotation
    • http://anvlaw.com/userfiles/file/50748759677.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/63292476747.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/9986528693.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce053dad6d---lozifazopu.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/palelidikowebo.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/fdd1f173a6afdd73d321e399edc8d30b/83537695352.pdfIn PDF document text
    • http://weclassof86.com/clients/6/6d/6dc59c75684a9be5e3a4726337e2fa3a/File/toxedur.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/mepitegujomopurukolegifan.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/segafevaronusedujezib.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/23fb4b37416f462a64670871259f3c38/gurepuvovujodakoribaga.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/fodepoliliwiforeluni.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d6f30ddeb33b6e19183ec73f4d55a88f/11265641572.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/pelup.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082b5505e55f---89621705792.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/66205952751.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e25dd83e1---tufajaro.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/26609133961.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/97f984e0d11980817ed53fcfee143210/wofofevivawuduvefejiv.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/95958191675.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/lufododojopopidobuz.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/24vtslb9dnvgcrlqttrqf1ucep/kodetodimaxugatezimoboku.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/n1k9tdsrcuojtaee8001vlpvn7/tiroropivupipus.pdfIn PDF document text
    • http://sdds.be/userfiles/file/6159463975.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/79168804926.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734a11ce41d---josolepesimapamimav.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_off000114f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F5 16712 bytes
SHA-256: 355559b6449a4fe3c9b637f76b2e3864e274e92478cb75d37cdc4318de3fa375
font_01_sfnt_off00014058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14058 11308 bytes
SHA-256: d6ca438ce9bdd3ea3c17177cdb0808b125471df209707249596627d498251ab0
font_02_sfnt_off00015aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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