Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16cf6b3d50718c9…

MALICIOUS

PDF

97.6 KB Created: 2021-08-14 07:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4369dd5025d6f7ad4c1a9e8fa30ae427 SHA-1: 7906034be1d3721e6d90faf2a40441d883af651a SHA-256: a16cf6b3d50718c9345869fbb109077e1a4bbad6cdd751620a45b8b0ecee7fe5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites, including WordPress upload directories, suggesting a tactic of redirecting users to malicious content. The PDF's structure indicates it functions as a link farm, likely to obscure the ultimate destination of the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://vietkinggroup.com/uploads/userfiles/file/83967111469.pdf In PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609843a69326d---tomofiwilifize.pdfIn PDF document text
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/16548995299.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8a49002b9---6340903890.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d06ff28f48---73792385647.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/fujedajitawekeg.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088729c534fd---buzirujite.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/2051aa43d3acfb17eca22b6c4799833d/pefatozofo.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/riwewukufa.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d53e1ff9b---rakewuzofumaremabam.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092f99f39728---64143796932.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/0bl1pf3g6fsirjkciojhj57fkf/tukawil.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c47060aa10---xejugemu.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/uloj29vharrpbg2qpegj8mgn2i/ziwafizavetaza.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/856775649.pdfIn PDF document text
    • https://mauspro.net/upload/files/vifinukagobejefupinako.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/62683520130.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c89cb7a84b7---radivobo.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/jukexekavus.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/51cfa85de264b03810a4fc9257866c01/56015171463.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/sufelagagujexopodozod.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/36844618413.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/59164399094.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/79464244333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=pentatonic+scale+guitar+pdf+downloadPDF 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_off000112ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112ED 19092 bytes
SHA-256: 703dfbc38df4ed1fb6ea641031f395e5662af57a013a8dda65dac93aae6e172f
font_01_sfnt_off000144d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CE8 10980 bytes
SHA-256: b196da643b38a90b4937d59a2c183550e0b0439c2efe9b971528a8e536604c63

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