Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddef52067eb5901e…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 11:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 852610185324f2f75bcc5a86bed744d3 SHA-1: c4f36da8704d129861dc95f06e693c65b20b043c SHA-256: ddef52067eb5901ea7e6542f3947f8b0f8095b8ffc27293c6e221629af29ca98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/5dde353257eccf64309caf80bd523fdc/43118408645.pdf In PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3b23135cc80e193b13064c0a835c21af/kimibufup.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de53a0d27b1---36381657439.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19e44dd88f---53858296892.pdfIn PDF document text
    • https://wonkingchina.com/d/files/18743132065.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/e0iq8ntcd30bksp71oc1pbunj6/74865593900.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/76029051254.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/jaletegino.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608a27c7ccbeb---sawerabajibideruxewuvu.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/60517332464.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/zuzivokamad.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/94911696102.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e86af7de18---44963603763.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/gujikixivixobafelixuzer.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/it5299iqkuatn3ido5a4nbc25h/wumurigige.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b9a53516e---bokoxubasav.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/68414424054.pdfIn PDF document text
    • https://netpage.info/userfiles/file/15632635167.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/munabiperogopapilezev.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e722f2c07---gimeninetoxufokumojumuxiw.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-5/20210505155902448730.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/mitoxurasuwigaz.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16125ee744ce1f---zovafin.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/zededotamonasudilezif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=take+home+pay+calculator+2021PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE036 18100 bytes
SHA-256: 3813ed8b60869bf9138855bcae2cf8794866c6e35c41e97ca55493b5168453d5
font_01_sfnt_off00010e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A4 10836 bytes
SHA-256: 5e312d985e645f9ddb89105a4edba5cc4428a524d1c87f02e9ad8d59440ce0ae

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