Malicious PDF — malware analysis report

Static analysis result for SHA-256 091366e4f03e56fb…

MALICIOUS

PDF

92.5 KB Created: 2021-09-12 08:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7f774ef8902f1f7bb71649fe831a40d SHA-1: f459f3a8baf1516d68aebd7153927ac20af871e6 SHA-256: 091366e4f03e56fb6dbe2253ec6b29b559f92fe87dbad2d3d973c5cb4b3041c1
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous embedded URLs point to compromised or disposable hosting, suggesting a link farm designed to lure users to malicious sites. The document body was unreadable, but the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://laborke.ru/uplcv?utm_term=saw+2+full+movie+with+english+subtitles
    • http://kayamedbursa.com/userfiles/file/26262027668.pdf
    • http://agppi99.pretty-match.com/upload/files/zonevunaxulojoserofarux.pdf
    • http://dakov.hu/_user/file/65028635929.pdf
    • https://sherwoodchamber.org/ckfinder/userfiles/files/29141288966.pdf
    • http://www.w.radeton.cz/ckfinder/userfiles/files/61315716580.pdf
    • http://3q1p.com/upload/file/210902053458699501b88n38m77gja.pdf
    • http://cuatro-pr.org/sites/default/files/file/vukijozawosuzaduru.pdf
    • http://xiangzhuan.tw/upload/files/15810480063.pdf
    • http://arablift.net/userfiles/file/lisadajesebijir.pdf
    • http://rosniyom.com/userfiles/files/85759399435.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7b3f8cc58---lewovozajad.pdf
    • http://cp-tournament.org/ckfinder/userfiles/files/nodusutelubumorafaku.pdf
    • http://medicom.pl/userfiles/file/zoranibuwufe.pdf
    • http://topspeed4wd.com/ckfinder/userfiles/files/vafupokipuw.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381e479e529---28248244239.pdf
    • http://eyela.kr/uploadfile/fckeditor/file/naragiwatosawoxe.pdf
    • https://bednidhitraders.com/userfiles/file/wavalalejikabepurugu.pdf
    • http://stylekd.ru/files/97588050787.pdf
    • http://tareeapartment.com/user_img/files/43588955276.pdf
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/diniduwoxalev.pdf
    • http://litho-and-co.fr/ckeditor/upload/files/bisasedojiboxirakib.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f70361e69e---1192159887.pdf
    • http://s4l.vn/storage/ckfinder/files/90659422117.pdf
    • https://astoraccessories.com/uploads/ckfinder/files/48990324126.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_off000104bc.bin
86b266b3439d1436454166e0e677783e5c20493a26eb0317d0ad72425b1961be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 11148 bytes
font_01_sfnt_off00011ebd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBD 16792 bytes
font_02_sfnt_off000136cf.bin
d8f02d6dc944afbeb395bb9407bd06b9cba1f41d172c631f5d3d295b0668e251		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136CF 17480 bytes

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