Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4e04f29ee4ce11…

MALICIOUS

PDF

85.1 KB Created: 2021-08-21 03:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f8274d566fc556676c8e9d34ce356532 SHA-1: d3d59d078606fd82adfe80950c46e0b3882165a2 SHA-256: 8c4e04f29ee4ce11ccfeda3968b9c96626d93fa3b92d38be7d5d24bee4e41df0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://ajivikafinance.com/userfiles/file/pasesutefavomefojibinak.pdf In PDF document text
    • https://alakharia.com/public_html/userfiles/file/balezenoduvejiredibi.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085ea7d02e44---8757382856.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/5ac6khtg8phi0rr5jjn3n8tct7/darufimuzijakaroti.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/zekibatusegode.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/4ki6rasolj2haq2oh2pooh90l4/fajabugazinegumiw.pdfIn PDF document text
    • http://minicabii.com/survey/userfiles/files/85491058931.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/koronuzejidulesoxoji.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/49259338372.pdfIn PDF document text
    • https://longhoang.vn/upload/files/12038829422.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/58141116374.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/defagujuzurijuvibejifeb.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/21136172804.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/tinunopaduluvafoveja.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/88251329367.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed22d185a7---13779162364.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/r5e6fr7rf924uhgi3kficprte3/90975286767.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/870dea5fe0b67ee507f8590b0235e5c9/49317063981.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/fazakademu.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607946718d2b3---megeworuwatu.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/dovodolanoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+long+to+charge+bose+soundlink+mini+iiPDF 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_off0000e367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE367 11224 bytes
SHA-256: f23937b2e585e10fd5be3e77569ddad7c10de321c91d37e906099e94fc628dde
font_01_sfnt_off0000fd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001156e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156E 17976 bytes
SHA-256: 6926c14dbea26bd8a9a1c6202f4937dd23d56c49acad89edd43eedc3c03b2ae7