Malicious PDF — malware analysis report

Static analysis result for SHA-256 a079f3be5dd43c80…

MALICIOUS

PDF

70.3 KB Created: 2021-10-03 21:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 1e849b6c86f296e785ae9a11e3a6ec04 SHA-1: 92e34e81c907899c2276d81f83dce9f00d609e73 SHA-256: a079f3be5dd43c80589758d03f98ffdb875ac31b04100814ebad34f5a9276022
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing trojan. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing to a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=italian+all+in+one+for+dummies+pdf PDF link annotation
    • http://lightningriskassessment.com/ci/userfiles/files/tixejajexo.pdfIn PDF document text
    • http://soles2walk.cz/data/file/38512373368.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/lafazaguxefijizowu.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed1afd258c---24066146261.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/3853681ece4dc4a13bf43aeaa1723035/47723169429.pdfIn PDF document text
    • http://chromavials.com/d/files/dawasowuk.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/9839275798.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/magodarudi.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/dawaxo.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/57919125339.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/99618459239.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/dijufonepuxuzumunu.pdfIn PDF document text
    • http://turatabor.hu/media/jugexikixiresibin.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/zisupedijimarexisuvepot.pdfIn PDF document text
    • http://akgdsgfly.pretty-match.com/upload/files/vosenonojoj.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/jewaxanolivawopuw.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/joxinafelabuw.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/mulojejozosivupamotufemu.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/h3adli12m28krr3ehj0uifal3q/31482305543.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/weroz.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/leporoviguna.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/kerizolarux.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/bcc2faa024601d488edb01f4c7f666fd/wanutisi.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///zapimodavejezaf.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/81465573834.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_off0000b474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8B 10708 bytes
SHA-256: c6d470ea03c63c1a299f1743110e0712b56e1ebc031ce9859ef998c6e1c2037c
font_02_sfnt_off0000e510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE510 15144 bytes
SHA-256: c2e59209bfa5dab6e78701dcb4ff9ccde084a7eb4e6861606286f5075ad541a4

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