Malicious PDF — malware analysis report

Static analysis result for SHA-256 658334eccbc0f7cc…

MALICIOUS

PDF

104.2 KB Created: 2021-08-09 21:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 664562abe27d7522cf670c2cf8d31803 SHA-1: 8239cf13e8586354c7b8e63f247e09a2d76b9d2e SHA-256: 658334eccbc0f7cc270429b70265414c8d770107b1cff72fd76f75c5c857d2b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories, likely intended to lure users into downloading further malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dc14745f0---56114974482.pdf
    • https://bandai-k.com/userfiles/file/sujivezirekuz.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/3d35c000af4e692ca55e6e12feeca5c5/49806240177.pdf
    • http://e-park.es/img/uploads/files/rajesoxikiliti.pdf
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/40472323386.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/73c8543fe67e527ff3b5edab0e28d7a8/87505062997.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28634d7be---41023685502.pdf
    • http://anninh247.info/upload/files/pilifavanilid.pdf
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/paborulodujanonuxamo.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/755860d9b90783f28ca3e309d382aa88/jojonovenonodigujikiko.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2ee83d4ae---juvite.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c7fb15c5a---jexulalasafefoxeku.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b489a8a9480---zakelusetazejitoso.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f760e4d0e03db1acdd9adbef5e283d6b/28487296639.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d532e3cab69---lezosinuwusikewiriti.pdf
    • http://architettogherardi.eu/userfiles/files/wugodasesojegawa.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/etmi14dpvblnluhniv0oovubl6/pabidebeluziwilitezap.pdf
    • http://angarakshaksecurity.com/userfiles/file/56971743492.pdf
    • http://ellenia3.eu/userfiles/files/podoxejilomite.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e21f271492---2526011404.pdf
    • http://moyamoya.center/images/hand_uploaded/files/50278935382.pdf
    • http://khyljg.com/uploadfiles/files/xuvademoge.pdf
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/99057775910.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=kureys+s%C3%BCresi+tefsiri
    • 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_off00013457.bin
41b54727debbccdde7cb1788ffd256d9b9aa1ae8d9e36fdd30dcb560ec2720cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x13457 10172 bytes
font_01_sfnt_off00014afc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AFC 16792 bytes
font_02_sfnt_off0001630e.bin
a62df57603a2f0e52bed1c4488cfb9201a54ca0c54592c14861c7b1477e25b62
pdf-font-stream PDF embedded font (sfnt) at offset 0x1630E 18968 bytes