Malicious PDF — malware analysis report

Static analysis result for SHA-256 794e8853f138fe7e…

MALICIOUS

PDF

69.5 KB Created: 2021-09-18 12:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 46ad0b7a0c813478673e73161a135937 SHA-1: 1d4f37827d3c960640d27f7477e339c899111e9b SHA-256: 794e8853f138fe7edd890845bd8d420145bf8a9ba5bac438c2ef1ed77963e213
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories and other potentially disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure indicate it's likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mygenius.ru/admin/ckfinder/userfiles/files/niwoni.pdf In PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614277b4d435b---41335285344.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/bezujedoluraz.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/sovedidimodugi.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/33277571257.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/94199795777.pdfIn PDF document text
    • https://uangraja.com/contents/files/mukogipevaxosokafisolora.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/juxowenaxazaxidikupeke.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/3429473227.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/94714350989.pdfIn PDF document text
    • http://rcot.by/pics/files/34630140.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/texova.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/f9cf8e741a10220040793950a078aa28/ferusixujufaguzar.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/wemaxaxebutizovelumagibov.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/40285466160.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/79609980162.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090414323892.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/48774487284.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/wowelikukubosipude.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/61208914187.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c89c9581f0---tubajemojejumamuz.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/zofalevadax.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337a6ddf293---xadiluvasuluvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=swf+game+player+downloadPDF 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_off0000b193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AA 10760 bytes
SHA-256: 441a73469d5262b98dc1cb0add4e6c3454f2ec30c14ca867397298b4f44bf29a
font_02_sfnt_off0000e23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23E 15312 bytes
SHA-256: 4f0b2599546802f167cfdb250e37933304e7639778743356052d2d89cd651cd1