Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f64898a04a3c4e0…

MALICIOUS

PDF

95.8 KB Created: 2021-09-02 05:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f0ab7e152e7dc6f680ee1f685deb2586 SHA-1: 22e93fcfd4e35c7787c801a4a9fc32123dbdc760 SHA-256: 3f64898a04a3c4e0ecd633a362b234b560438404c57dd14de6a26ec16ff5b6b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS uploads. The primary purpose appears to be redirecting users to external sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/29d3a478878adf82bd8bdfe1bc61f5bb/wamigelumubefiburenal.pdf In PDF document text
    • http://sclifeguards.com/clients/16854/File/67837288704.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/31214300883.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/satiguvamitobod.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094fd79a8f2e---16707536241.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/71a4d3f0dd27b5bf71b48c91fa65825f/58134255230.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/mevulalitono.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/vakagovuwukijotas.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a49e63cb720---8064749745.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16125eb3b8ce98---30504208993.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/tivudebuxizavipefas.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/79450357686.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/wopevutef.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/zufifomadabuvevolokukok.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/97841632166.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e59b06c619---890203999.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/92c90b7d070fedadc2eee2c05cd75a0a/tinibireliw.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/kogubizusulode.pdfIn PDF document text
    • http://haphadoor.com/upload/files/xasopuwumasulesekuzare.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/85027116745.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c88c1f0a4---11277524415.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/gabomazojosupir.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2124c781bd62d40eb1a67f0741dfad8/52560939963.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/87633333510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=wpb+area+codePDF link annotation
    • 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_off00011688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9A 16800 bytes
SHA-256: cf562e783d944ee1b855af2001e2d0048fedb06f242ed1749716565301c32e37
font_02_sfnt_off00015ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AC5 10132 bytes
SHA-256: 899cae512db4c3d39e7706ffd81588bac2f3ea34d0c4d5eaa29b7f09bdfc3ef7

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