Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0fa3b9ee983bea4…

MALICIOUS

PDF

77.1 KB Created: 2021-09-12 22:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3baf65c282ec8a0b40d19796393160a3 SHA-1: 75c6ff4da17d299b158cf487e34d7cb1bb5c87da SHA-256: b0fa3b9ee983bea45982f60d21b4d1c4fceae4138d23d414aa25724b0f8f9f55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://ormansagszive.hu/upload/file/jusabagup.pdf In PDF document text
    • http://rszm88.com/upfolder/e/files/20210911034858.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/39580104568.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139998aa405d---26448172587.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/jilipojitumufibi.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/rusivi.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ec5aef2ed---jakomujamega.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/gafajaf.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/vawewesudivatul.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/6639350567.pdfIn PDF document text
    • http://scantech3d.com/files/valufilavutejewigaze.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/22744818525.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/8502168090.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/pejomajeg.pdfIn PDF document text
    • http://hzqzg.com/d/files/sukito.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/8ff5782a049836a740462a6c51aa5202/66978845732.pdfIn PDF document text
    • https://ccskin.com/geektic/files/bovalukajixelogozovemiduj.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/lefefa.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/tri288bnt80bijprmnj6b5koj5/rigamaxit.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/76308720356.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/dofokubiw.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/vexajofobofesiwazilajeli.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/kefagujixopizaferaxeba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=mario+64+wii+u+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_off0000c93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93A 10268 bytes
SHA-256: 9a19b6124e7dd5b39f5a1e35c346bd75664e17eeb888b491cf9d4ef760a2d879
font_01_sfnt_off0000e07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07C 17692 bytes
SHA-256: 0f73fdec1d13d4348b0160f935a2477886903dc09e8a4bb7fcb2cae6bb061335
font_02_sfnt_off00010ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1