Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f54bf9c8c3cc71f…

MALICIOUS

PDF

87.0 KB Created: 2021-06-29 23:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 241f8febaf48480e73bf43b41d430784 SHA-1: 141d1990994e8b0442843c8c3463703becd6be08 SHA-256: 1f54bf9c8c3cc71ffb4bdc74f147f9fb4cb0b2a8a4f617c4fe68c674e4a5b215
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites. The ML classifier also flagged it with high confidence. The primary attack pattern involves luring users through these links, likely to a phishing page or to download a second-stage payload, which is a common tactic for malware distribution via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=jehoshaphat+bible+verse PDF link annotation
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/e291c995dc8251e7fd853c6ff02e759a/6997318986.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/pq270fvggmo21e1mn8aljvlmr5/77762774496.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/befoxodowipisokug.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/botekeletafitodod.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/24345315986.pdfIn PDF document text
    • http://schokozentrale.de/idata/62487031521.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb27a34b98---37665960868.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/10952595666.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/jseruvf33ng2idfp49duebsnt7/37233058401.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860ed0a76bc---ruxedisevutumi.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/33650846162.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/24040731399.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/f14c7e95ae2286d48cb41ccfcc0dbf13/7402635635.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/0d2d8c257bf6e26de2af6c23e56a29cb/97288048825.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/2c39a6466a7a3c6dd7d2760645b3775c/53061393732.pdfIn PDF document text
    • http://timebymtm.com/upload/files/99676875449.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/bf74923d17d3918c8eae5392b3eeef98/83114516051.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2057562d46---peluruxuvewetedefodemo.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086637ce0fff---jilanijasipixobufapo.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/bapisekakolesuko.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/u8u0jha9gvjqqtuqq7ps0rcugp/31452113079.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/kakurip.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/697cb1939a524b3bd6ce27e0a1220dd9/67025076350.pdfIn PDF document text
    • http://jfk1969nola.com/clients/873000/File/48313466921.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c568a6f29.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b030d85b6---xezonaxafepov.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_off0000f351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B68 10440 bytes
SHA-256: 56b66aa07f3026641575cb3088bc5ad6726cb607c9db98766d8a1f0d7ac8d83f
font_02_sfnt_off0001230c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230C 16868 bytes
SHA-256: 49a3dfc23f84d6d2faed40640a51db1742ddccaf4b7deb48e7b723cc6b52001a

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