Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2ba4a54bcbc7d8…

MALICIOUS

PDF

79.1 KB Created: 2021-09-03 01:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0daea249b3817994b3bf9621075cf420 SHA-1: 928cc7614521d9c741c912a5d0c73f8c0023b046 SHA-256: cf2ba4a54bcbc7d87adec73ae2f2a0c65114ff4649f1cc81d55c847a40306c80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to domains associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior indicate an intent to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://shen-su.eu/gfx/userfiles/files/zifabudan.pdf In PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/cbe403d6ca4a5440003b0d1323e84157/keviz.pdfIn PDF document text
    • http://japhina.com/upload/file/polikusovuzutejom.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/20814238116.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/dulajunuvejotesidebabo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/pj0mbo7dp98k647ft65cf4l4c7/zowonugiv.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/77045367186.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/filasotujidopebek.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/feviguvak.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/varoketawozawi.pdfIn PDF document text
    • https://bem-sa.com/img/file/newonimakasiro.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/4jihpaa3k23m00pkq7ivif6sg5/58989075530.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/fuxokoladomilataw.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/wusakisumizaxemat.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bacdcc2aa6---xivazonegejefoxajoman.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fc2eaa34ccd---19372617605.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/xidujujukakavudivolar.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/woxupupaxujapelot.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/93286075507.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/aab8dc61c94e5e09d30a95f834b73956/ruledidibajuzorubawizufo.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/83359610211.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/xatuzurivu.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ca361fb19---sufudegitewujunufa.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/300056405013.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/124215a951cad3dc03d76e6125bd35f0/piniwemegeleri.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mubonulupibabesamumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ptosis+palpebral+pediatria+pdfPDF 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_off0000d6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DF 15724 bytes
SHA-256: 7613ede9e2d89fc1b9d323f42689c9bbe104f50e584f054954e0334e03dff2d5
font_01_sfnt_off0000ff0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0E 10528 bytes
SHA-256: 2a9b3ba6bf672c842cace72aa2dfe0d3085502784afc855d5f01c6ef3ecdf129
font_02_sfnt_off000116f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1