Malicious PDF — malware analysis report

Static analysis result for SHA-256 f981008f785fe431…

MALICIOUS

PDF

78.2 KB Created: 2021-08-31 07:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d93b9594418351fa9d2e7436e5c41e5 SHA-1: 0c4bf57c5c22a8f10ed42db9fe1d1c530d0e63b9 SHA-256: f981008f785fe4314fbbba86ec3b381034c04e2fa6ecc31e5c44d966d46dd4df
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a tactic to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

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://harissarantis.com/userfiles/files/venogurodefuvojunor.pdf
    • http://aliceinformaticasrl.com/user/pages/80401702434.pdf
    • http://nonstopsushi.com/uploads/files/89677084857.pdf
    • http://pettwayfamilyreunion.com/clients/39389/File/78664788977.pdf
    • http://birzebbugastpetersfc.com/files/file/xesudafonixositu.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/134b91da0a4a4b98cfd4fe8c1771d178/dedejiwasewilemo.pdf
    • https://taechoclub.com/FileData/ckfinder/files/20210715_B968D86F68F0F730.pdf
    • https://powermailer.in/userfiles/file/21880093719.pdf
    • https://bandotrading.it/uploads/file/povopozezeweru.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b32adc0b26e773f403fc47c019cd7f33/66773596769.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/9eara864itni2tv2ucfqnt8o1l/jakoka.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070d62b80e5c---kabubozi.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/5b85d7b59c8825452de5db10240b1bea/rumuzo.pdf
    • http://garmagostaran.com/Upload/file/jifumokigolatolelo.pdf
    • http://runhouchem.com/upload/files/xetolelepibikibat.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/e1f39f76e7709fe6112f9bca2ca29803/lumidir.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16112210566971---11169806844.pdf
    • http://hydrem.ru/images/file/takarebigona.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ds2kjp4a3nd60n5p0c7vnh2u88/77179079514.pdf
    • https://greenfuturevietnam.com/Upload/files/kitonemenin.pdf
    • http://maekuangudomthara.com/ckfinder/userfiles/files/mugiran.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=bechamel+with+onion
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1E 16792 bytes
font_01_sfnt_off0000e530.bin
df42ad76d64191c19db972d7df53bbe1b379ca95bebd2c1fcaefbb7cddf20ba3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE530 17608 bytes
font_02_sfnt_off000112c6.bin
ed50833f5bd21d1c02158184f219b9e5df7744495fe566e9593ac458e2132198
pdf-font-stream PDF embedded font (sfnt) at offset 0x112C6 10368 bytes