Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0a1fe125aefa39…

MALICIOUS

PDF

110.4 KB Created: 2021-07-22 09:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a2c4b4728fae7fa592c2f56761a0bd4 SHA-1: 2de7f2a3156eebb36bb77109c82f7924c50e4fc9 SHA-256: 4b0a1fe125aefa39691a4b2e80218de3e7ca82a86ec750caeb4d5b7160bd59e7
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple websites, many of which are hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links on disposable or compromised hosting suggests an attempt to obscure the final destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/fb14ec7ede7fe7bd7bf2bd4e7d2defcb/kemovelob.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/7a93b8a2f8b7549aa244e72c3d7f75f0/loserusifilalaj.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/253d9066b6afd3bb95c316d6b1567f1a/55131841280.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/pou92d285nud5ngqhj201kooo9/51912720434.pdf
    • http://travelci.ru/ckfinder/userfiles/files/88198075726.pdf
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/vuzasamoxupoburijiv.pdf
    • https://carsen.sk/editor_uploads/system/files/turugadikesakekanibi.pdf
    • https://noddy.nu/images/file/josugolawifotipobovelifa.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b6645b8db---depuvobos.pdf
    • http://birzebbugastpetersfc.com/files/file/1953342272.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dff524e6a---mazuvodolepibumedejuna.pdf
    • https://noithatkuongthinh.com/uploads/files/73348236048.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/0911d27e15f277bd6484a35a1ff77478/xorazivajivuw.pdf
    • https://ofertaromania.ro/ckfinder/userfiles/files/34563215217.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85cd18a18---linijejuzesi.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acadeda4ab---mozobajanaroxotu.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/q21d8grl558rgarlrddud00iko/wuxuxuritotolixiv.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=365+days+writing+prompts
    • 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_off00014ac8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC8 16792 bytes
font_01_sfnt_off000162da.bin
dc55303af11371dd338f642dc1f3e31829360cc2dbb78b1597df5f9e5e7fb8e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x162DA 17792 bytes
font_02_sfnt_off00019135.bin
51c0e6a64277a8eff2cdbc73e0dba8e124e57045860cfacf85aace082a7993c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x19135 11136 bytes