Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6938bc17c0e762…

MALICIOUS

PDF

80.5 KB Created: 2021-07-25 06:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eae614e4af04858c8bec56ba68aa9b73 SHA-1: 1adbedebdfe1c111cb122be2475039e9e4d997c2 SHA-256: 3a6938bc17c0e762d007a0774635503ed33e8b77b6c96d4a84941716a81d64e6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or phishing content. The embedded URLs are a primary indicator of the attack, directing users to potentially harmful resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://greathorserider.com/ckfinder/userfiles/files/91092577980.pdf In PDF document text
    • http://shreejians.com/userfiles/file/57539625055.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/lunapifetozetox.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/e5722d7086f9811a79d655d8d748e119/tafelanerelutotoxix.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/nepuwokuniwi.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/9963077351.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/b8pmois80m6sq54ddc962unhc4/67186797639.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/3ca37caae23086e178b0ff357fbe0a66/lujezelewa.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/av4jeescondmknd6664rd9qmj1/gavegirodipevavow.pdfIn PDF document text
    • http://willbramephotography.com/93573052846.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b164fad28df---deronuvux.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/7198724453.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8728978e6b---21954255054.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/8d305f1997b8341756a38d12e8d27743/8117826366.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607316d1d763a---31871046078.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/36601248645.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c89be2cedc---razajewaludetepatawaw.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/70876235992.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/dagem.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b268904499d---fefamefukalo.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607517f6da9a9---tugirali.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210714_151714.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3452db562fd5a7715a1f7bd60b86d483/vusofedisipike.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/53565004991.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/85474144705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=fundamentals+of+building+construction+materials+and+methods+6th+edition+ebookPDF 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_off0000d562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD562 11400 bytes
SHA-256: da94d9655cad56734357d77bff7e39fc24d0ea613707c22b19daa3d00f0d92fe
font_01_sfnt_off0000efde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDE 16656 bytes
SHA-256: b4f3de5a1d48785a9998d1d3454e2854403ff5e56465961ff7ad7fb10dc0e8b6
font_02_sfnt_off00011b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1