Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4df8000238b575…

MALICIOUS

PDF

82.7 KB Created: 2021-06-28 05:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0110dc31d8053c13c54ad358a01bd821 SHA-1: 02508c74ce7dfc3b3c5a832fe860ccd40eba2437 SHA-256: 3b4df8000238b575ffd5ed61595b5fc376a5a313fa4832a9540244d1c2ec536d
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs pointing to external sites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable or compromised hosting suggests an attempt to obscure the ultimate destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/8242807352f41b20bab93423818a257d/kefodotom.pdf In PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/60381259386.pdfIn PDF document text
    • https://arerp.kr/data/file///20244735434.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874beb7fb05---nizulosivefekogegude.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/fapetikuzan.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/jilasugawapoxowor.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/risepojuf.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/52731855e08e405c92698a8f8d048200/7967265570.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/pepuxinodarewonuzabupe.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/ab76ba30ec3f5c9be9f0c6cb80399ff9/gojojizetajibanerad.pdfIn PDF document text
    • http://manixcnc.com/ckupload/files/durumijosorovuvagaledag.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/9phh5548hg1get1hb2pql7ph84/pemewagobefumuf.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/rladjcumflf8tu6icgukp7n3f8/62905922605.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160824ecf0e983---39733720979.pdfIn PDF document text
    • http://vejwun.cz/images/44235068617.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/8sb5r4rg194v108gpe7jsm47h7/funedojesoponisanetibu.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5970172b3d---35555671865.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/6559a762f4380c06a9f9db4115a77509/lofudovawekodatu.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/gugexebakasuliluzab.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/teselafimunavetudavini.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c96d1ff5f2d3ecab4f2af3ee058b0c37/8501681025.pdfIn PDF document text
    • https://mfdesign.hu/files/file/gupamezobuwinimegefago.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8be4378302---vivebemujukegedigorosadon.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a01a874080---nesenuzuwekaker.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/aqgj2hoipnika8foh7hibipnfr/76194818711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=dry+skin+near+nosePDF 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_off0000e3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 16312 bytes
SHA-256: 9c1d0c391232cb2b596fb78f24ed9d58c08271dc36e5363fce13077acdcd938d
font_01_sfnt_off00010d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9C 10164 bytes
SHA-256: eba33f274291b09ad805c4f0e3d38264b9c0f15fa62f200fa37d2294a872ddd9
font_02_sfnt_off0001247f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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