Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ce50127c2c5c73…

MALICIOUS

PDF

89.8 KB Created: 2021-09-05 03:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 508c8233777e9b218cb278ee91f8cd62 SHA-1: 46820f213a89af397a855c744da7f1dbef18eecf SHA-256: 63ce50127c2c5c738615e41af1be4fbef4e08fdf1d22e6be4581acd6ff3c873f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to what appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malicious content. The document body is unreadable binary data, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d94b82e3d---85613236544.pdf In PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/oabvvq25ffo5s50svl8fj9mqe4/pujebumagokivajadawix.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/salogatasetugux.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/molojuzixolubazifomo.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/tekituw.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb575426190---ligidafometafozevalepase.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/gijuko.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/96333191923.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/gvla4k6v9jd07g6jc5787co3s2/13024705021.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/paxaxubadoj.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/1305774148.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/85865586140.pdfIn PDF document text
    • http://poiskvod.ru/images/file/82195436348.pdfIn PDF document text
    • http://tchid.net/userfiles/file/juduzanepudobuxuzigizu.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/61635091387.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4fc44728a---24760750148.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/gebagavazonokomap.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/vazutakigunidigabijuzisu.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//muwezeraronozovof.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/xovuresesarujojaxomax.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/nivodakigeta.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/merilasa.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/43689028528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=what+is+centralisation+and+decentralisation+pdfPDF 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_off0000f7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD8 18740 bytes
SHA-256: a6361e7ab7d09152c40ddc928cc2c34bd01f43a2858c9dece0e0f7730ee259b8
font_02_sfnt_off000140da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140DA 10708 bytes
SHA-256: 8c77f1c33e3bbb2462afc4f4ae574e4f139210b22a03c256939c195b8c68b0b4

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