Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0732db8eb9d3c1…

MALICIOUS

PDF

96.4 KB Created: 2021-09-23 11:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4ec0a0025d492e424a57f9da75949800 SHA-1: ebfcbe8a50d30e0d424115c1449d4ae58de02dd5 SHA-256: cb0732db8eb9d3c1e2a715993094bb0ebe998237071a84e848b17ac81268f87a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress uploads or disposable domains, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and an ML classifier also flagged it as malicious. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://coretry.ru/uplcv?utm_term=cardview+ripple+effect+android PDF link annotation
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/susupada.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/pegarekefefo.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/vofipexujevopewuxuxovegor.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/zosuliwu.pdfIn PDF document text
    • http://csc-027.com/userfiles/file/20210917145002_wzrzgk.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/puromono.pdfIn PDF document text
    • https://iword.de/userfiles/file/katulalenega.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/f901cf73062d8277484496abbd77f5d9/717113088.pdfIn PDF document text
    • http://btfa.tw/upload/files/xidovopux.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/40662798126.pdfIn PDF document text
    • http://chicopharm.com/upload/files/60086545244.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/64011249634.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/navegijidedimevigajal.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/jp97jdv54s4v1tnm8h10c3u7r3/bizibuzediluvu.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/20646046955.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/1984293052613668ef263b8.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/jesd04c4b1q1p93c10frb4o23t/lozimazarowezufisodabixat.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/zewojax.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/fuketedusesipapif.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9024f76316e8174b4ae35729e0bb853d/zuvipovabapimotu.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/1006575322.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/13696420040.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fc7106a2c---joraberor.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_off00011521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D38 10628 bytes
SHA-256: ecd9fef34229334130ed8a3226eb071f70be0d6df8d545009fe9a9b17a8cf225
font_02_sfnt_off000145b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B0 17672 bytes
SHA-256: 4b22e24c7faa7e3ff7e4beeb97d65681491519e701a2151d540e4b0d991b0d39

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