Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fd98aadaedfcaa…

MALICIOUS

PDF

67.9 KB Created: 2021-09-21 07:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f4fb52a4653e0c2de82ac0af1e14dbd5 SHA-1: 3d8c8b505b176e64de683f0be5fb2082845f3db1 SHA-256: 41fd98aadaedfcaaa3d01a7376409552d26db3716120e9928a5fb87f2d48f8aa
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates a link farm on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=poke+io+games PDF link annotation
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fikifusogenozefegakex.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/49615025022.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/7922644339.pdfIn PDF document text
    • https://finliz.lt/i/File/bibelumedomu.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/bebovinij.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/jaramod.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/98473480596.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614515086eb56---sewunosojezojepujidokafe.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/9527377857.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/rikegasezezuwakofevak.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/db9ca2e2a3ca3e3a68c333abdd23d4c8/21223842920.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161315a967fca8---30971848514.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/85751278746.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021092110171273499.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/retuniwenuzuraxeka.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210909170056.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/80047654352.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/norifemepujemeja.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/vofipafisus.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/razapunoxalina.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/38891250675.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/7769732186.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_off0000adb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB3 14960 bytes
SHA-256: fae4d1d829feeb03af97f514bbd0448bc6806bb59541d012bde459062d47a41c
font_01_sfnt_off0000d39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB4 10196 bytes
SHA-256: 0925ce2b07a16963e4212769f124e0e4a9b5f94e599833b9f44782b8e6bc1dad