Malicious PDF — malware analysis report

Static analysis result for SHA-256 749cf3f61b6ef529…

MALICIOUS

PDF

89.1 KB Created: 2021-06-29 13:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 23891573f284d5c89ff9a5d27bd8c9bc SHA-1: 366a8173216336304104892aae8351166e32b952 SHA-256: 749cf3f61b6ef52958fe32b9f401af0b82b29369c7c2705a85064d095c03ce83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites hosted on potentially disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://agro-vostok.ru/userfiles/file/polopisalodu.pdf In PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/6a2c143c5152c431f7a213daf30d0dd8/xepajapufude.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/23062724276.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/3d565b9bc74bdae7a17405bb18b44b4b/pagufonunerorixizenefosir.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/87756183836.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/mubobavozejajedele.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/fmllcl5tpj9gdmhatp4o317822/22846622184.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb7e326764---jojujilolone.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/81555704974.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/4daf1e19e8ea857fc1b6413f7e9c2518/fogexilijagatelurekele.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16078b043f0a78---mapegare.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/bf48953a67e1e6de90ee217f0af4d026/2384861193.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/53680239870.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/lagimapataniroporofafo.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/1bf502243f0d299ef6f2d942d4afb012/34694394775.pdfIn PDF document text
    • http://sgpeo.pl/users//file/27179517316.pdfIn PDF document text
    • http://elitvorota.ru/f/file/leperusolivomonafetuxe.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/wafotaruku.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/aec3377fc6a6d9e966e4133c1ec3def9/madomoxedibopezodini.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160812c2dd2aad---gufevejatufeg.pdfIn PDF document text
    • http://samtle.net/ckupload/files/61200885146.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/0a6e0f96c4085512890b9829a1922ce5/1090280244.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/13274221024.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/1tjj7t2ttocsndt0lnfi8vcsoa/risalasevu.pdfIn PDF document text
    • https://maturana.cl/upload/file/wuketaxuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ruby+baking+showPDF 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_off0000f723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3A 10588 bytes
SHA-256: 70d2a0c03687f3d3804090c9069edab7b56d33ce41de328398f550b684188937
font_02_sfnt_off00012761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12761 17856 bytes
SHA-256: 543e74ae63aa6fa40b8704b52739707f5618265c0da4318ba1d2ca2fdd8e1667