Malicious PDF — malware analysis report

Static analysis result for SHA-256 939ed92569161738…

MALICIOUS

PDF

97.0 KB Created: 2021-07-01 22:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1446bbd11f2b9b74d45464f8d683ba1d SHA-1: be7226e42e97a49e465015f2f27b41f30c47f17f SHA-256: 939ed9256916173800b3dd324d03efc49bcf780e59df4eb889818afe3166d843
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, identifying it as a phishing or trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

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 http://bbfederico2.net/userfiles/file/pibitumuwadufobel.pdf In PDF document text
    • http://fpole.ru/sadm_files/lowasinuzeponi.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d989adde14---tudinomilemisot.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/20529169022.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1993410fa29d74da6fa5b737c6986ab9/53334920156.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/71jg4agpvruj2lbrrnk5ram7ch/jagupojux.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a8fb3e2cee69bc773269540b98a5cbd7/tadizevasexawiw.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/wazosimenaf.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/semuvutere.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/dapiwerif.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0e1e159ef---99034398642.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/xofatujugoluto.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/38823c5992c9b37b7f1b7e5c3bb268fc/52763470995.pdfIn PDF document text
    • http://liyangah.com/Upload/file/98588522674.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/d6rf0aei93vormoehfbopkc9u3/sedow.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0fbe8bd6bf2fc4d305c66aaef24d984a/kinojadekepivemi.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/c46f5dc631f095c0abc3adfd36d17df8/tagudimobaj.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160825a8922947---kavejufasalekojubim.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/lefegudutirasumiwevo.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160918396243ba---32694792031.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d6885a972---61027752105.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/igm5c321fmhip88lc7t3ogmcfl/95639122979.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/48586856c13bfe6cd8cab62493ce75a7/37882017182.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/bajemugiwafolulubej.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1584766a6---16946595528.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/31485893074.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/vupiwosapir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=mvvm+survival+guide+for+enterprise+architectures+in+silverlight+and+wpfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10973 11312 bytes
SHA-256: a218d074da83f32a44dee2c0e2c069bd2d2c9aa1d4858f8fc3f6072bad583fc3
font_01_sfnt_off000123a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A6 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_02_sfnt_off00012bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000143cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143CF 18156 bytes
SHA-256: ed43530477934327a4a119052be5f591b4fa972d108c73215d858aac96430a5b