Malicious PDF — malware analysis report

Static analysis result for SHA-256 829e193dd36cca04…

MALICIOUS

PDF

86.4 KB Created: 2021-09-13 04:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5a929b3bacd79815e3f31b1ce44b79c6 SHA-1: fb283ea72dea097e67fcd1133544f612467fe101 SHA-256: 829e193dd36cca04d8b13646618f7d873a870795832b6e7a438ba56386b84df0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm are common tactics for delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://medvor.ru/uplcv?utm_term=minecraft+leaked+accounts+list PDF link annotation
    • http://anshan56.cn/userfiles/file/1631034298763394962.pdfIn PDF document text
    • https://korankertas.com/contents/files/piroroxifiwerelaxubegofax.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb95a5f684---54240977342.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/fowuminumiwosokagiz.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/59257922171.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/gusizusidurasonikiwese.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/nexaxisinavewexefake.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/tilubad.pdfIn PDF document text
    • https://tigaintan.com/contents/files/57045722970.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/megolujitejevamesusel.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/lukegusixa.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ko67ntkgp5poaocqpjn85p5nru/14027932284.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/25280391987.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/80298418882.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137b3dc97d79---32426592598.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5565c30f37b6dde9e45d48e0d9d0a3ce/90666758021.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/jufasonixu.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/47956997855.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/7169367260.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/70650685583.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/86079404921.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/zujibinimusiz.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_off0000e726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF38 19412 bytes
SHA-256: dd690b59deb6ee4a7c629f65ab8e05d478e91a16f1d2558896727f8928a0d828
font_02_sfnt_off000131f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F4 10652 bytes
SHA-256: f6eac26d80965c7d95ac0b1027d8defd72a83c6f98488b466bd409c3586e223b