Malicious PDF — malware analysis report

Static analysis result for SHA-256 a609935e8afd491e…

MALICIOUS

PDF

95.0 KB Created: 2021-09-08 20:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 75457507dfe1b90454720796610f728d SHA-1: 163f6f7bbfb5d8b94ef4694b4603895d9114e0e8 SHA-256: a609935e8afd491ec5431419ace0f3d69e41b4cbfda2e56003e6d21ed15cbbb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://huntic.ru/uplcv?utm_term=gestes+borel+pdf PDF link annotation
    • https://kattliv.com/kattliv/admin/userfiles/file/kufosikovu.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/74242112794.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/16951942161.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/41244010424.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/muburapox.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25931673138.pdfIn PDF document text
    • https://ivanamihic.com/files/23305604226.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/59244370439.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/dozixojanomovakifimavazex.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/38345957689.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613082cc4b8a9---nimoxavejovafimixaso.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6bd5a0b19---sejegagig.pdfIn PDF document text
    • https://dukupahit.com/contents/files/sewizujivedojesulagobas.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/jagubukas.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/58193985541.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/28235029143.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/83247703975.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/6d3f1539f58b357aa1fc2cc7d51f5aa3/61034282109.pdfIn PDF document text
    • http://ned.ru/uploads/files/vukupanarekas.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/gubopareta.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/34443698739.pdfIn PDF document text
    • http://orlickachata.cz/files/files/witimilafititulenotiwibin.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/91062082092.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_off00010bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB5 19452 bytes
SHA-256: e38da67e14c25896be65ec64ef7baea58f637ff06cad4859a27474ba78bdffc7
font_01_sfnt_off00013f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F14 10312 bytes
SHA-256: 1a4dad598d49163a2c97704814a2f7a9ace74ac28d3e8c58ccf9622b106e86af
font_02_sfnt_off0001563f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1563F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1