Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8debef6109be5b7…

MALICIOUS

PDF

75.0 KB Created: 2021-09-05 19:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8c01a0667a501b43e0e31bbae96d66ce SHA-1: 9fc04666618bfbc3b7a6bd4674eec4bc176a7a1f SHA-256: b8debef6109be5b716634b7f8548251b1204406ebc91cf378c1771c439ee12f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=common+english+adjectives+pdf PDF link annotation
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5801848b35---givasirawowakomiz.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab896a7f5d6---dubatip.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/ac58b0ce871abba3f5a55d27695b7cbf/32757384994.pdfIn PDF document text
    • https://marigabung.com/contents/files/wefozudijoku.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/7582785164.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160719fea2ada5---21474682542.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/mirakotuwuvifepuvij.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/zimuzoxoganaru.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/d083c93d618bd34638dff3c053384ddd/jarijodejipetu.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/be27c2341f7291fc7def4af8b204fa3b/karexiderumutumamirepevo.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edad07ba1f---valavojadizugidovakiz.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/funorexem.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9de387b82---sinamadozojeremufabit.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec78c5a3be---judexoxakomiguzu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbe1a9e981---tosavavatodumaremeziwu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/fefogozaseseroxomax.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084670abd51c---30176320269.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/60125346328.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/euirq9itp70cdo5udj48igf861/xovivutoz.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce3e687fb2---61180957686.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///88811569556.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/vugavuzefu.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/nonojewegidosuneriw.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/605c7c08dc2507b3c54ce3288713f82d/mefusowimaxuzopopip.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_off0000c023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC023 11196 bytes
SHA-256: f9e388b438e608e47d74e96c0f8f76105d903577ca2d0b73098555d2b4e5b298
font_01_sfnt_off0000d9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EE 17316 bytes
SHA-256: 05664b9786efa31f65c44cca90324fa7b3aa2505345e8e88b6c225e10ec8860b
font_02_sfnt_off0001060d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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