Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b59725a4e01da3…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 19:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2ae0d41cdefe976a4886077138dfe12d SHA-1: 1b79dcdc0b3636e7f58a542597e27bc9888f0e9c SHA-256: 25b59725a4e01da38f8e9180cd9aec62667987ca98c71103fb7cb40ccbb42e93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to potentially harmful content or for SEO manipulation. No scripts were extracted, but the overall structure and URL distribution point towards a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pistant.ru/uplcv?utm_term=best+open+world+mmorpg+games+for+android PDF link annotation
    • http://nhatminhtrading.vn/app/webroot/uploads/files/35455668294.pdfIn PDF document text
    • https://medtek.vn/storage/file/jeloxozadepazeri.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/fojenasotipotoxif.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/nipamif.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/82850923120.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/59449734471.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/60430958706.pdfIn PDF document text
    • http://e-sportis.com/images/upload/kesujuturudasifilo.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/8941175753.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/8733662629.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/gadijigipaxutuga.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/jutabosezomuwukotoxatid.pdfIn PDF document text
    • http://pronobile.com/catalog/file/juvurefekakabebitigevevum.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/keduxolakifodovepudibofeb.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/9s4f5q7crv4u9gpaoo9ihjre75/87603829718.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/60141308221.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16149e69ac2d68---bijivanegeweparukojuvepa.pdfIn PDF document text
    • http://vipdiler.ru/files/file/89562035568.pdfIn PDF document text
    • http://tchid.net/userfiles/file/xugebirepopefajoxufixexu.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/76038598799.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/69190532173.pdfIn PDF document text
    • http://vit-physio.de/file/larofesad.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/3168d66c6d8cf23ce0c2ac46ce4b30a6/finujibagaju.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_off0000b2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AF 10980 bytes
SHA-256: a1ef5cb85410c420687914062136a850a2e57f0470cafc6edb7c64921c3387ea
font_01_sfnt_off0000cc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC04 16680 bytes
SHA-256: 14281a7619e228643768526b317b362a5a1341f22986f208f1833a45ac739dc7
font_02_sfnt_off0000f63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1