Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f1cbd18159287a…

MALICIOUS

PDF

81.2 KB Created: 2021-09-08 04:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e01b5d27950feee35de39b47b982071b SHA-1: 38bc9fdd22ff81de2f6afda8e033e95ab74cff6e SHA-256: 23f1cbd18159287a706399abf8d21dc1c3a21faa2ea70f025104061fe8ff5432
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate the document's primary function is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a002119a7f---82595597872.pdf In PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ab3d5e11---xebuvizavujuvimoxax.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e50a73097d2---pixanejube.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/317247583.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074242389867---12189477855.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cf27f4b6bad---35915024170.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/4130672060.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/90889299826.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/xekig.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/59705038663.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c6a031213---30060462653.pdfIn PDF document text
    • http://bio86.fr/fichiers/71033307434.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/95328801434.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/38734436946.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/nuvikawinafulizolap.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/laregosaxikiratu.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/zepawakopaw.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/21282531956.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/79b5a3c9181b2b697f78e0c21a2f98f4/38417492138.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/bin0cnntiv6i4u150a5r8pj4e1/vurudas.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/31629228925.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c671a9e434---23123752658.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5fi7gmd7opgi8bdedcnmpcktt9/77516365659.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/a040a589d691824f6c8371706260708e/33282486923.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d95cd0bb75f---31881254475.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/dirixususekibewojudolex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=payroll+management+process+pdfPDF 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_off0000dab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB8 10988 bytes
SHA-256: 88a4fd6e05e7ed5ba7cbff5b14c9337d169abf01d13d3175280998800713cbca
font_01_sfnt_off0000f41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41D 16616 bytes
SHA-256: 0c8aa583c12b1650446d3a7da883e1b291bff217b81c95e3df9e0e435e599b56
font_02_sfnt_off00011f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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