Malicious PDF — malware analysis report

Static analysis result for SHA-256 334fb47bf96206b5…

MALICIOUS

PDF

72.4 KB Created: 2021-09-12 06:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 582bafca017970dc40095601096d613e SHA-1: a1e1174ddae98eab606c91b77f0f37f30b3d66cf SHA-256: 334fb47bf96206b5a5928d0eb5641222f106c86a1ac27be10be49a64c9c45db0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to potentially compromised websites, suggesting a link farm designed to redirect users to malicious or phishing destinations. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://frutapacargentina.com/ckfinder/userfiles/files/sibonexefulomemukujizal.pdf In PDF document text
    • https://hondamienbac.vn/userfiles/file/gififosevifuduwis.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/rexirumugusevunenaroxez.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8a4f5f661---76478333835.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7ff977bc5---mebetefuserixofojojovasoj.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/52710133684.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/36478261223.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/zakomudewotelisad.pdfIn PDF document text
    • http://praguetransfer.com/files/file/pepinorivafubejow.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/javurumaxe.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/wovekobonate.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/xusebufuwopurakorijudol.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/toripiputezaralasi.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/rakukajosem.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/sekufenevifotewotoropebum.pdfIn PDF document text
    • https://thehouseproduction.net/file/pitosexufutezexupuder.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/wolakenaz.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/06057fd622ee7ff9a5065298be889079/16638227118.pdfIn PDF document text
    • http://dogable.de/userfiles/file/22866489748.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-7/20210907015645870075.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/8865827227.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/21479396583.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/kebiwejum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=http+portal+office+365+loginPDF 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_off0000b8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C9 16040 bytes
SHA-256: 1c816c1759b6895fefa3aac7a4b4a534116cc3a5ff87989ef44cc81dda2edf8a
font_01_sfnt_off0000e224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE224 10952 bytes
SHA-256: 70283715934d8bfb7b4067bd869ca59b98b3f13a92af3208a5fd1ef919e6f8a4
font_02_sfnt_off0000fb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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