Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44f9dd0edc02028…

MALICIOUS

PDF

79.5 KB Created: 2021-06-29 06:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6626a7cecbc2477a13a897cfaf1b07e6 SHA-1: dbd8b141142481da0b590fbe5471cc88f5156a44 SHA-256: e44f9dd0edc020286094cdeeb1ec10f3be543e53a59344401c623c5ecb8db7fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, suggesting an attempt to direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://learnersdigest.org/userfiles/file/11745652646.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/6c7154294fec8c56eb620bca175a78f5/80903320278.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/2731e02097653b2b4112660f78886a5d/xuxok.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b4037a106---33019341795.pdf
    • http://vom-ragnaroek.de/uploads/file/66887674948.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d2cc6b08f64---25166156883.pdf
    • http://51-lq.com/userfiles/file///44404296726.pdf
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/n0os09blnnqs295dg97b5arnn6/64783618139.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/qbneoh6jf4jfg87pq5446n9nsk/mefolilibawo.pdf
    • http://stphilomenaonline.org/userfiles/file/80160288840.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/un1ffpgj901qr2bi1ivcov1kju/febipimazewaj.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/d989c634df3b33733f35f3c144ef7f10/renirizepizirazoxa.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbfd00ecde1---dufokejiwukatujawo.pdf
    • http://slbreakingnews.com/ckfinder/userfiles/files/juvitipusiro.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/5f405167ef422611d80cba513b501f59/97636100630.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe8879e547---vuduximulemovi.pdf
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/nagenumowelojowiku.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098c3dd83917---88061579951.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071eb0de0194---25369765178.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/0dd0fa4f83a5f8dfa3a90e23120f3ba6/dukewutuz.pdf
    • http://abacusnancy.com/userfiles/file/wirinuk.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/4fed6c34d1a4bdc09d8898e74896d084/nenubiwamiboxud.pdf
    • http://aisef.org/uploads/userfiles/file/file/4116397610.pdf
    • http://diysmart.net/userfiles/file/bosija.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=electrical+machines+by+theraja
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/7bbf6f4cfc088d595ac9ab74d0ade7e4/kiruxelik.pdf
    • 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_off0000d1ff.bin
19837541f95ce1b053331b1cfc4320c37b1ec66c6124050a8bfc7452e435662c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FF 17576 bytes
font_01_sfnt_off0001004c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1004C 16792 bytes
font_02_sfnt_off00011863.bin
49a029dc33552bf75f96c5c75cc056255bc176df52d24585b115c46bd205caaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x11863 10740 bytes