Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37c5ab6d79df591…

MALICIOUS

PDF

87.8 KB Created: 2021-09-02 01:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4f00966572e8f086a626864e0353856c SHA-1: d98baa213a076b59bd9286a5de42a242a25f4c2d SHA-256: c37c5ab6d79df5912a8a7d1cf1c17b83de9dcb000be0b6810c937150d81611ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites hosting PDF files. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25eabc2436---44352416717.pdf In PDF document text
    • http://anthonyvienna.com/sites/default/files/file/dojunagitorokoni.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16105b169b9ed0---warenevejemadorubo.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ds4uqrfct4934utev5s60notp0/futepusafupelalogoxov.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609adef96aa58---kimirovajuveludasoli.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/luvujule.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160812b26e0b1c---79403080442.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/9f860db6f9a3ee3d65feaa8c6e35502c/sixesuzeparuze.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/26595761434.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/98247137480.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/91601252351.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/13554046492.pdfIn PDF document text
    • http://hifi-markt.org/kunden/kronhardt/ckfinder/userfiles/files/54405671773.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/vazafafij.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/3d7eb480ee309ef9038df8c411410e60/80011578241.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/0cd6d9f0c3774cd0f09a3270697bc2bc/davoritakutiji.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/6bd47f552ebcde292c74ff705ebee0ad/pimedogatepepolaw.pdfIn PDF document text
    • https://camelcarpet.org/d/files/maluwikosazokizuma.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/fawidujeremazetemen.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a70f002908dcb979a42ad071ca9d0359/minosuxexexigekaxo.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/xegidulofalexuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=very+dry+mouth+and+lipsPDF 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_off0000f0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F5 18452 bytes
SHA-256: 352bd89b9ad846a443ad748ff381cad79f302f6b2bef4c62b899874f27019d24
font_02_sfnt_off000138c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C3 10840 bytes
SHA-256: 4421c8c356ed3863786b850203c14fd45406d9f2c037ed6400d5e6e5301fde18

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