Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a5eb1736e470c5…

MALICIOUS

PDF

88.4 KB Created: 2021-07-02 04:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a851c7fd6377d22204ca545ee535f12d SHA-1: c3789744542cd1daae19346a26d36a8a366f80b2 SHA-256: 99a5eb1736e470c51c4013a1e6f05aa8fb0f8bef2062e96f1932be71ddf1674e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination or track campaign effectiveness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://ptogel2.com/contents//files/99132197817.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c301194c9---81513415435.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/5be7d5bf39d9f4ad4332602708a8a5ae/zenonevivabi.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/c7c17ef0ab8654cb6fc39e9c58ad1932/21849129905.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29ce5c54ed---39056383471.pdf
    • http://innovad-ltd.com/userfiles/file/vonaguwow.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160782088dc602---91931414783.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/af78f273fc9c61d5a5944cfb9eaa34a2/8965681476.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/951931f8eb110ff6ff53da217c0c064e/25373976444.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e19bb8f1a---jenupagodabubikusaxovo.pdf
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/6902312026.pdf
    • http://delvalle68.com/clients/54584/File/xisotebipigivekos.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1e7b37941---rizepegotam.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609271f362dfb---11063601811.pdf
    • http://csc021.com/userfiles/file/20210611052459_nbd2ix.pdf
    • http://tbm-mova.by/images_from_html_editor/file/93140375237.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27b008f78d---xopokojajojegurudotux.pdf
    • http://sxcec.org/userfiles/file/xegatakanev.pdf
    • https://mk-promotions.com/ckfinder/userfiles/files/kevanuxelonigomaz.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/rbhj7r46fkcgrn1q265grnmttd/tuwobuvufozipidoboxopazij.pdf
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/noravik.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cca78602833---99384231630.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/bf99a1c24d94c72a6f388847b1a7a47e/pezojuresoseguwojikiremax.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/3nildfm9o705ss8bepsfnjhuc8/42557450368.pdf
    • https://monyetjoget.com/contents//files/45682221412.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=sickle+cell+eyes
    • 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_off0000fbad.bin
c6251911b306dad899e9609029d3547dc2b63a31a36f088e240c5654c6b979b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAD 16528 bytes
font_01_sfnt_off000126b6.bin
c1eecf7c6a7558cf5065b6e61211cbc1871f81fb4c042f20e2aa53936c22ae23
pdf-font-stream PDF embedded font (sfnt) at offset 0x126B6 9920 bytes
font_02_sfnt_off00013cb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB0 16792 bytes