Malicious PDF — malware analysis report

Static analysis result for SHA-256 17df9aa304c1a336…

MALICIOUS

PDF

90.0 KB Created: 2021-09-06 11:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2333559627bb67427d18a248b2c9d6b6 SHA-1: 8ddedd715268f9c2a1a4b66449dfbd2e742cc483 SHA-256: 17df9aa304c1a3361e2d25b8955c81f57d75976c488b97a97d7e531591fa7af5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://inwebjor.ru/uplcv?utm_term=sex+linked+inheritance+worksheet PDF link annotation
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/menapeg.pdfIn PDF document text
    • http://szwygs.com/upload/26427919297.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/bimefedesevikamote.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2678b14b0c---wiwomorugarokeba.pdfIn PDF document text
    • http://henca.com/files/details/file/pifonojosemefedotapa.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/96716280368.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/964f2f593df9dbbd64c324c0a94e4867/wotasiminofadavevokural.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/nidakeve.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/polesomusezuduw.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/101600193971.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/65948958599.pdfIn PDF document text
    • http://lucann.com/Upload/file/66133413807.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93da4d55d7---pimezawodurodofidabubano.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b36bf87b0a---sexufuve.pdfIn PDF document text
    • https://juegosinflablesarizona.com/files/tadorozojuxedozi.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/74397654735.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/wadebufuwenob.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/fumukebepu.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/nagajodepusodumivuxirex.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/2jsq8ka4321kgd88lqu76sfecd/27934671252.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/676164767.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6e2dbfe1---getovitajutas.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/41312914331.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f4aa2fbb3---kipale.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_off0000f987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF987 10824 bytes
SHA-256: 62fa1cf23199189e7332ad35759a77b274043ec4f186a1cf391d3cd654c093c6
font_01_sfnt_off00011278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11278 18236 bytes
SHA-256: 072ad1bf741887188bb526971029e79290924be27c19985eb32d29efd5bec851
font_02_sfnt_off00014224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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