Malicious PDF — malware analysis report

Static analysis result for SHA-256 762750edd3344c60…

MALICIOUS

PDF

76.8 KB Created: 2021-09-13 22:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5c850a6b44ca7faeae9efd724bcca9d5 SHA-1: 2e35b85ea3c9a9ef60f91c001c8bf6cdba0a3071 SHA-256: 762750edd3344c606210fc6e70beaf8873bd83d917abb833fcb12ca8974801ad
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs, particularly the one using a raw IP address, are suspicious and likely serve as the primary mechanism for delivering a secondary payload or conducting phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161384e1cd6772---54829952437.pdf In PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161353ae9559a0---gateriz.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/78365639360.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea1e629b27---lupanojexifiza.pdfPDF link annotation
    • http://allamericannursing.com/userfiles/file/39608507171.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f4130d977---30819448582.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/57105135870.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/gexakilulijekoloneb.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/dofurunikelumemidumo.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137b0aa41f2f---jivudidipoz.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/lutivowalu.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/tudalilofeg.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/44509480817.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/37695354622.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/28636950053.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132f1009f7bc---malaramel.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/72832616777.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/69755094750.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/zoxojopalokigobasewum.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134677747de9---fetapasetozu.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/mujn564trdvu2ma9n8he7gp3g0/rutatof.pdfIn PDF document text
    • http://anpo.vn/upload/files/dugud.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/83302830029.pdfIn PDF document text
    • http://robedecreateur.com/img/files/79253260595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=apa+7th+edition+statistics+reportingPDF 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_off0000c55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD71 10776 bytes
SHA-256: 5909c695cb6113eb62d05fefb05616f75a2524461acf41681ceff495e682b461
font_02_sfnt_off0000f61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61B 18264 bytes
SHA-256: a801c25c4aaeb74e486d06255939928b952b1c728a06373a4ada0bc36f4cf375

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