Malicious PDF — malware analysis report

Static analysis result for SHA-256 5845fd17eea20ff4…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 07:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dcf564f4ab220d13abcf1932620b4693 SHA-1: 5e94740acd858607e1afa3753cba9679821726c4 SHA-256: 5845fd17eea20ff49efc6c795e12bd32ae83fce5a2f137384f19daf2d28ad666
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://ketchas.ru/uplcv?utm_term=resume+examples+2018+pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/1tap38k3pkcv5k7ctogs7ffd3l/paruruxagu.pdf
    • http://teifsepahan.com/files/file/zevigojo.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca85a88269---sonanogomatos.pdf
    • https://777mto.com/contents//files/17168760376.pdf
    • https://dursunguney.com/userfiles/files/60760881053.pdf
    • http://tpdw.pl/userfiles/file/movaselaxagidafizizukuvuw.pdf
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/pamomukekowuj.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076e530d3726---sunoreb.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/i48c6j16gr8hor1aentb389hah/gesezafojup.pdf
    • http://morpheus-architects.com/file_media/file_image/file/jileneb.pdf
    • https://kp-bs.ru/upload/files/42996132782.pdf
    • http://kvbm.org/pds/userfiles/files/mogajepedejitarokorivam.pdf
    • http://el-master.ru/userfiles/file/33141344749.pdf
    • https://shieldtech.cz/ckfinder/userfiles/files/72420571770.pdf
    • https://eminenceconstruction.ca/viking1/uploads/files/jakogewabuwas.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8eb9d4e33---21503627332.pdf
    • http://siripanyalamphun.com/user_img/files/rokebef.pdf
    • http://labonguyenhoang.com/img-chamthi/files/88040688725.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/d17dea311f922805992cd197518ab461/42884358544.pdf
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/98661406893.pdf
    • http://app8itebarandgrill.com/admin/images/file/57921807523.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b918bbc8d10---61179771368.pdf
    • http://tribo.kz/userfiles/File/71681118684.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_off0000dfeb.bin
7b4f3f8e58cd1412a4aa8dfd78e0d77835ea5f77cbee6897b81cf67ccbee565f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 10892 bytes
font_01_sfnt_off0000f943.bin
27aced3068b053374280e794a20fa4532c0b5e600ba7a51f9e5fdf340690905a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 18252 bytes
font_02_sfnt_off00012883.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12883 16792 bytes