Malicious PDF — malware analysis report

Static analysis result for SHA-256 71be7b30d3f5e767…

MALICIOUS

PDF

84.3 KB Created: 2021-06-28 16:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 80cb39450404eea77f186ff2574918a9 SHA-1: 89bdc7767393058ecf9603af135a6b8df6fdfca4 SHA-256: 71be7b30d3f5e767d791a170339fdcf4d0a5bdc6b99ba825acdd78d1ebc785b3
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of external URIs and links to potentially malicious PDFs on compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/bbd0ebe67b2fda933c417e8e4d96fb6c/lexule.pdf In PDF document text
    • http://agcslohian.com/userfiles/file/fomutomaludig.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/ee2dd95064b6f43cb6823b490c978324/gadawututo.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706c42dd665---kefuvomupudutoxilalejoxi.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a035fbda6e1---molekuzisixisanutugaguw.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/9517770713.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/3236c655236d988cbd68148528be6fed/12048527684.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df3cf2488c---jotunaxijopoti.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/18011135645.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f05146cc6c5c206d30bccd7bf64174aa/mepiravidelifexatefejode.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cc5c8c1b9---17765264493.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/36a64d97fd347730d051b07b22462b49/3989408558.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/df739ce6890ce5d0e7dc1508cd14108d/wofafuwanini.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/31067560363.pdfIn PDF document text
    • http://billsky.ee/files/file/balinemu.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/lf612ag339toi0sqtpu0bb3ehv/bejogen.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/293b3704a0632d1fa222e6cba50a18ce/30548960000.pdfIn PDF document text
    • https://songhong.info/userfiles/file/49743832789.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b46a716c1d2---37987709126.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021061103203980554.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/70064421780.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ag7q9mcfd81m80lqli19qglmpe/dobagolakeweten.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d2f7693d7---18282718454.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5c3h02naa9sqii5pliv3uhhvm7/befuvumumofemol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=autocad+reader+download+freePDF 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_off0000e8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E9 16756 bytes
SHA-256: bbde835a9c21198b7834db923ee37f8d5b0631bd5f165ae8d1b04ac3b2066c99
font_01_sfnt_off0001145c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C73 10376 bytes
SHA-256: 9c9b6c169320f72a611ad431485aa246ca8d2748fc8784d171f1a557610b1d41

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