Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c2b48dedae326e…

MALICIOUS

PDF

81.8 KB Created: 2021-08-29 13:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 78296689a78555a3d562039204b23204 SHA-1: 1d3d1009f18bee3ea9136f17e54ac8dd6fbd17fe SHA-256: 31c2b48dedae326e43e5d4e0819e643f5bffa73ce14b7f2368d4b770f54a3b82
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, which likely serve as a link farm to redirect users to malicious destinations. The presence of these link farms and the overall detection as a phishing trojan suggest an intent to lure users into clicking malicious links for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://laborke.ru/uplcv?utm_term=jesus+was+not+crucified PDF link annotation
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607474b9d1e66---didubutabubitesunapobe.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16119e7e7af17b---77597572559.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/sufobixajulonebijelezuva.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/nopokejijakogajobavub.pdfIn PDF document text
    • http://epoetryworld.com/clients/53741/File/guwuwutijusu.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082b72f71062---42107079152.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/96827121893.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/xomuwifotupavutodaxavaneb.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/81987499536.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/9577581263.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161259b70e69a5---misorojowawetuzeni.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/gagewow.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/99543531759.pdfIn PDF document text
    • http://juha.be/_files/file/2904633573.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/9b83c2fb6d03ba309f935f2374ea0ea4/jejudopar.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/gipapaniseb.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/11790081318.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/3d2d312a3ebf18ee4075da7c7c211a8a/gokaxinurinevobojutilufe.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/52901081586.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/fudanojegekeril.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/l5g6mu8tu0h03e9tp6nv5c9h7e/37986397026.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d65e3ae87---48391802338.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/20891352510.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_off0000d8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A1 18664 bytes
SHA-256: 04ba21c5a06d5a1d1ad6558880f48d26e1b38a653ae7ff7339f1da9094071e22
font_01_sfnt_off00010890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A7 10600 bytes
SHA-256: 6f5e3125881ddd8d384ba0addcabdf04cba861741403c5a91a8fbd9f5157cd20

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