Malicious PDF — malware analysis report

Static analysis result for SHA-256 732a3622676521ce…

MALICIOUS

PDF

89.8 KB Created: 2021-08-02 17:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1c99000693afba5d68e449da0328e684 SHA-1: 40d6c29ecab3832eec42150ffd0bd3111d8e9d9e SHA-256: 732a3622676521cee4aaadda241591fefcb1475579b44ab7f3e951524e30fe4e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://ketchas.ru/uplcv?utm_term=after+by+anna+todd+summary PDF link annotation
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca0b8e76b---zinalenedojoli.pdfIn PDF document text
    • https://appfacile.it/file/54044835390.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/99853092253.pdfIn PDF document text
    • https://petek.biz/resimler/files/3923681025.pdfIn PDF document text
    • https://chptravel.ir/data/file/minilijodesanukusuxubu.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/lenidibotokijabudemirugot.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/tanefaditabozuz.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/38645979989.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/donajumuga.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/nugovigulaposifuti.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8f4a1eb0a---xugiwamatuxu.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/659d734005d44faa5e3cf816da28b671/tigesomatijiwujokexim.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/efb259dc822df7eae260f6bd1d75e022/96136602953.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/17845748933.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/938124124.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e91afcf622---35892183879.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0647a75cb---75523334737.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f684241c1d5---vaxozamen.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecbf8cecaa7---66005431818.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/84449163979.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/76080416852.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/xonuwezevizoxeka.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/4528926de313c0aa978697b742dc3589/64926642929.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6080884ba---71094538956.pdfIn PDF document text
    • 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_off0000fb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB53 16976 bytes
SHA-256: 7bb9349749ecb8f7daee8ddc6ee92e1d266744c0e826b794852fa8aa4270060f
font_01_sfnt_off0001279b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279B 10712 bytes
SHA-256: 47976c68a3bd38bc1ec788e24ed3f0ddddde268bfa715eb9961e52bf24f06b32
font_02_sfnt_off00014044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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