Malicious PDF — malware analysis report

Static analysis result for SHA-256 67afe39c383b8d40…

MALICIOUS

PDF

97.2 KB Created: 2021-06-29 05:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77934502498eced85620e6733f98c415 SHA-1: f3e799fec64f1f1588c30401fd9314dc52895319 SHA-256: 67afe39c383b8d40f7d9489766282d7087940a20563962bbef3946215453ded1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/fa67512f6c581e8f1644c32a4e8cd80e/xexidifa.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/5d0192c7673599f223d5e5e14ebff8b7/rulujukam.pdf
    • http://coinproject.com/userfiles/image/file/fenobomoxoz.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/c107b6fa16228255e295be74d330d6cb/dejoropemunel.pdf
    • https://hissekurban.com/resimler/files/sixuxomajot.pdf
    • http://yngc.ru/admin/ckfinder/userfiles/files/zalozobus.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f5894ca9eb---silalubevaturixinurafif.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072f17647140---xakaxonedemotovux.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/xudipixogases.pdf
    • https://fokusmedia.com/images/uploads/40038118347.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608be9cda1161---sakoduvemujefazo.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d68f0dba7---kabikilunugurenofabuweb.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0a0d2360b---doregabigajojoniwipuxa.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160701829ee686---fewetifepipun.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add4f706720---mozum.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7b623b5fa---84434126915.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8528558f47---kixax.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/c319e52baeaf3b7b0711bdc59d729917/vovuworozapovuxum.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/23e1d349c502ad702cde3a26e2e0e730/98661567587.pdf
    • http://shuimotongyuan.com/userfiles/file/befefesagunevid.pdf
    • http://studiogaleazzo.eu/userfiles/files/98820455827.pdf
    • http://jyjwqj.com/uploadfile/file///2021061501432518.pdf
    • http://fantalife.nl/userfiles/file/78915612588.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714abab7064---rakeresagejeduxupo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=juliet+prowse+naked
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011730.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11730 16792 bytes
font_01_sfnt_off00012f47.bin
707a5d70bc4d75f4dc834d7fd09582731b55a8d3dbd3fa5547995185c458d14c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F47 10652 bytes
font_02_sfnt_off000147dc.bin
ad26e8a4a699384fba9458fe110e1283bd8936e1a0afc73f010d61dd0a596c6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x147DC 18132 bytes