Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff0f471683dd271…

MALICIOUS

PDF

67.9 KB Created: 2021-09-27 14:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5cf2929636fe555ff3d001484f3989ac SHA-1: b8f8fd5791af0de122c70bf7a57d088b5601352a SHA-256: eff0f471683dd27179c136a1ac9f875f58aa23addb1fb8e6a71a1d49152a4e16
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and a machine learning classifier, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with clickable actions and a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the overall structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://infrive.ru/uplcv?utm_term=watercolor+sort+mod+apk PDF link annotation
    • https://securitydm.eu/slicice/file/33752427428.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/41782107501.pdfIn PDF document text
    • http://generoussecurity.com/uploads/68968237597.pdfIn PDF document text
    • http://homeopathyhk.com/files/98795220126.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vobapa.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/laruvepatupu.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db13b8b726---pasolafulikixerof.pdfIn PDF document text
    • http://allasclub.com/campannas/file/52471384470.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161317ef95f8de---fufewi.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/9251434271.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/nidoxi.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/moxisazisepob.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/66321952291.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/43805249028.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/wuwubemozepon.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/metewafevusi.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/3432773546.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/jopaniwatafidap.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d12652a31---72495289292.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/62487302291.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/91758366005.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/72421795923.pdfIn PDF document text
    • http://iucecb.com/files/file/bowuzixox.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_off0000b007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB007 13696 bytes
SHA-256: c49860bfa3330edf52e1cf703569603a435c266bc594420f1d5685531ed4cb91
font_01_sfnt_off0000d1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA13 10564 bytes
SHA-256: f664d815306ef0a496cd7079e1fdbcf7cbba0579986d9046f3f5849f40fd1285

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