Malicious PDF — malware analysis report

Static analysis result for SHA-256 636946788862c228…

MALICIOUS

PDF

90.3 KB Created: 2021-06-25 21:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6881796242dffcdda620ed4139ab40c4 SHA-1: 1fbc8a7afcd80358fb0dc973f9b01f9740d05409 SHA-256: 636946788862c2281f3a336cb9cd9e060e584d8a511eb7b10e1399d8b8484a14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=greek+goddess+of+arts+and+crafts PDF link annotation
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/l25hk48t2mqs72v0e10dfgjsgl/27463919400.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/5f45b7b7b76ffc45bef0814286ee1fd6/23616754098.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/korowu.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4bf7aa8d3---pugalutovuzanoxezor.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075107d13ebe---dazujubisajalijed.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070583159ae7---47079620406.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c188176fa96---dogenuna.pdfIn PDF document text
    • https://castel.ro/userfiles/file/sojigudi.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/800d76cd8678651ee9e21bbbe4392a5e/mafizejufajunojuj.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/jasonavoz.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/ded57eea0023fc3824d0de857b38d24d/xifob.pdfIn PDF document text
    • https://akemi.ro/hirek/file/xomubojama.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/75416643268.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609148d28304f---92094272140.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846c23b27a4---73722092649.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/d397061e3f017cd1c4fa3109ca393611/vibemi.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fba096eb7c---41790363639.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/getebukumonafatimatuko.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/65754293274.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/porajofamuselusan1621770453.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/kunazepakexuni.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE5 10644 bytes
SHA-256: 8a69aa9ffe276819edada23123b1da701f5625df30d7ad3af1c6fbfc81c41995
font_01_sfnt_off00011641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11641 17776 bytes
SHA-256: 5598b216e6235880047f7d9095eebabb3fa70fba174e876e2e53075f02c78881
font_02_sfnt_off0001441e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1441E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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