Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d94e015e68b6f14…

MALICIOUS

PDF

91.2 KB Created: 2021-06-26 21:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 296245095bd73fa7f14d8c6d580c995c SHA-1: c03159b1562307d8ca90121149a7adcadaea9d5f SHA-256: 8d94e015e68b6f142a3beeb86131944078e6db5421c40b34a4b44d11c42790c4
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 WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL distribution suggest it's designed to lure users to malicious content through a series of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://brooklynsmokeshops.com/admin/images/file/xotunolabejawezukuxim.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/3531586811.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/7cf8ceda3f3b80ec17fb0e3d512e6367/vokiwofa.pdf
    • https://diaochue.vn/userfiles/file/15446372610.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/41b2a1535f42aa2f524c41e098b6179e/fixefitimetanurupew.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c9754bcc74e---20461808868.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d3667fef4---13379854317.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091acdc15609---jejaripi.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607879dc33df1---68067012393.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/69377f1d7ef1e1526adf3903e7a31ed7/36151664299.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ltjs8cd4m9nb3l9l6mvic7ji3j/30593174365.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/f69fdee6f9d203840fe6e52f88c8181c/povetelofitazegage.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c9e01ccd17f---60545526960.pdf
    • http://beijingxinzhi.com/userfiles/file/20210530151346_149856374.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b2bd7490e---99832915363.pdf
    • http://j-club.eu/userfiles/file/lurogoju.pdf
    • http://cerescommoditiesltd.com/Images_upload/files/jikefewiwadamulegejin.pdf
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/bijavipuxivokod.pdf
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e08624a71f---nugamuloxudobuguzaj.pdf
    • https://cowichanseniors.ca/userfiles/file/zudomejupu.pdf
    • http://nashcentralfalcon.com/clients/d/d5/d5bea9c86035def548a020f7371d19fe/File/kabikujizoxe.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160729386772a1---dazozimufagu.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16090bd05264cd---jinav.pdf
    • http://devison-matras.com/upload/file/24805985109.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=malaria+in+toddlers
    • 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_off00010249.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10249 16792 bytes
font_01_sfnt_off00011a5b.bin
c6842ade190366bf6133c6b592738cc5f50db20eb571c5e107e2bf74259dc6fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5B 17572 bytes
font_02_sfnt_off000148af.bin
fa9ff9834fda64121d7c033a143df7a55f85fa97b689286f5ce6e836ca535900
pdf-font-stream PDF embedded font (sfnt) at offset 0x148AF 10232 bytes