Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2518a30c16a574…

MALICIOUS

PDF

93.3 KB Created: 2021-09-03 22:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: cb9949dbdecec8b2a7e1b65d9088da41 SHA-1: d6b8971d9a60dfaa9b9eb160fdb267779d4c3ceb SHA-256: 6b2518a30c16a574bd5b706947f6429840641932a44414b2415b8db5a0d2d000
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wastran.ru/uplcv?utm_term=problemas+areas+y+volumenes+2+eso+pdf PDF link annotation
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/qjlk4h2a337l6p5tj3uu363lpc/tigagagezezotibilamolipa.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160bc40ae2f71b---xokebutagutakobitaxigo.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202108182358071423.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/dc4133b4e93a26fadba51fcaacead63d/282152407.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/73852849957.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/65685143435.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/65360794940.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/a8ba278238c486517178b56903916588/zuxuvenoba.pdfIn PDF document text
    • http://creationart.hu/files/file/64820898192.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850d71cffa7---51944417169.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738f9e50a5e---xejivininegego.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1028a1f0ca---15397420547.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/15862977698.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a73b59408f8---mutopigowireporitufi.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/3f33f6da9efb0a4a565cd9c3a886766b/70720752783.pdfIn PDF document text
    • https://tckontrola.hr/files/dadawevanelijozarovoxedan.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/zelaxufobukuxu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a926478102---wiwuxeduzokenodelilezonan.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/60910923982.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/nanolubunumuwepo.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/mumevubadavukukof.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16076e8c0599e0---movobamitolipawamugasuz.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_off000101cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CC 11008 bytes
SHA-256: d64e6fca211d2ef635466d44624092400a95a81bcb0b09d3f45059994a5884b2
font_01_sfnt_off00011b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13352 20148 bytes
SHA-256: 22087ad161f07c8a1123d6005e9e3d22f27f85b8dc29e6dac48f5906b90ca509

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