Malicious PDF — malware analysis report

Static analysis result for SHA-256 931e0ac89b6910ae…

MALICIOUS

PDF

73.4 KB Created: 2021-10-01 05:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d12db7895c08c2dde722d0e8a607d68a SHA-1: 2a78445584722d804c8fb41b44d29ec956c8f13e SHA-256: 931e0ac89b6910aece372c927e717c845f7acab6db5af9950669b1365fef3d59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress sites. These links likely serve as a lure to redirect users to malicious or phishing content, potentially downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=email+sitting+in+outbox+gmail PDF link annotation
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/1b08c393450e11f3429c16de784ad5fc/figefobobibinasozex.pdfIn PDF document text
    • http://bastola.org/userfiles/file/milokorufim.pdfIn PDF document text
    • http://suamayphotocopy.net/userfiles/file/10024467492.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d04b6cecc---76825180869.pdfIn PDF document text
    • https://greenways.at/userfiles/file/xuxudivoxoturo.pdfIn PDF document text
    • http://voyagerav.com/v15/Upload/file/20219307058605.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/44022868303.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210908211551.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/vojofu.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614829d3cda7c---25160037859.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/54647789888.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/xatigopufivenujumok.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/tajojavus.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/tafud.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/junoleluwopudu.pdfIn PDF document text
    • http://polipack.ru/content/file/dadepiperufadidaronome.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/6ttp6h63ndc0el3evmplmk4pc5/87005886466.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/80213105157.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/32491088087.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/jonetogawuti.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146275643132---67604602267.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109131627563569.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1239494d8---wuzefa.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/kuzemuwodovonidoxozetup.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_off0000bb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB63 10544 bytes
SHA-256: e1fcd19fdc05b30134e2f6c917ca4912f30a927f3aa0ac341f0c555a7082a98c
font_01_sfnt_off0000d365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB77 17276 bytes
SHA-256: 80f3cd82100317ac744caab4996e0d558d5575ddf8fb2b014f8991aa574ea81e

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