Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a44e5074a3d1d81…

MALICIOUS

PDF

85.8 KB Created: 2021-07-28 06:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3cddb6a76771ee7111f374d1b6f72735 SHA-1: 25dd0757e323c64d49174fe46c2e94a46b52d631 SHA-256: 6a44e5074a3d1d813f2304289dc2b12b82ba8d932f780ddce97313fbd61de4aa
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 or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on compromised sites and disposable domains suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medicare-darmstadt.de/bilder/UserImages/file/gutonefatafovogofuk.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/e2vai188k7uouj1pjup16ndvhr/jaloxu.pdf
    • https://www.ewdel.cz/ckfinder/userfiles/files/44576658228.pdf
    • http://ourdesign.hk/ckfinder/userfiles/files/bukodivenonadibabijimezon.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3da62ef3f7---mamefi.pdf
    • http://retroldn.com/userfiles/file/40859968416.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d92a80b271---24568226873.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c70dbc3fb---kibefonuzokad.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/b5273816a4df0ce5a037c7aef0e18d03/rosukamurapo.pdf
    • https://aartipalette.com/userfiles/file/xusudamuwenavoneripagux.pdf
    • http://sochisushi.nl/survey/userfiles/files/63462458139.pdf
    • http://thy-environment.com/userfiles/files/83650046855.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084b6abc9cd2---mikewux.pdf
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/56555099010.pdf
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210630033535.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b7258a6ef.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160acc96e8a942---41428909367.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/in88kp6a2ds499shhu9ojsung0/35651847822.pdf
    • http://tuderprogettazione.it/userfiles/files/pezezegixorobi.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f1a47e062---rovipobomuxijevowute.pdf
    • https://gites-les-bardots.com/userfiles/file/felukubilizudozugexe.pdf
    • http://booklandbooks.com/userfiles/file/finumixunalebobideki.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/0de7cba9d44d9132021fb492fc2ffae7/liluza.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=do+you+always+get+discharge+papers+from+hospital
    • 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_off0000e87a.bin
d7d766c2cce23fa431c47b36697f859a76eb7346d28cd2caef314f0b4502de7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE87A 17556 bytes
font_01_sfnt_off00011715.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11715 16792 bytes
font_02_sfnt_off00012f2c.bin
fb9298ab600f69cae74f627f99a91db3222d3d4261c78ab976e91dc348d78e9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2C 11264 bytes