Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7bedfbe591669e…

MALICIOUS

PDF

86.4 KB Created: 2021-07-25 15:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8868bc6f4eb3e09165209387469608da SHA-1: f21f6eedf5bf975d3e546d659ee7a53b1c9ed403 SHA-256: 7c7bedfbe591669ef9a59326cb5a4dee81084ca4d74fde3254a8dfbf86105915
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample is a PDF that contains a lure to execute commands, likely to download and run a secondary payload. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of multiple links to compromised WordPress sites and the 'clipboard command execution lure' heuristic point towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/6ca3b4f99dfdf1f333ec215b522cbe4c/97730550839.pdf
    • http://billedbutikken.dk/articlefiles/file/wikep.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/lghq1pe0e0a5avub7ef3k47ljl/17420785686.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/90dfe94091ga5s4nbpre7aqvti/xoxuwi.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/f866b1448c245063ca1777497199861c/28872340046.pdf
    • http://aqs-group.it/userfiles/files/zelix.pdf
    • https://ohcsi.com/ckfinder/userfiles/files/mutupodelafamozusuvofawi.pdf
    • http://jplus-ag.com/upload/files/BodyFile__60ECA78D1D420.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/8ea2c5ec71142a356c8f3f69a9f5cbc7/8184574705.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/1cgvngnfeo4mqcmjlnkud8lli7/83162256244.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0d716dd2c---rojiruxomubalel.pdf
    • http://thankschicken.com/uploads/files/mexadetuvopedaberadosuv.pdf
    • https://hotel-la-licorne.fr/userfiles/file/tagop.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/d47fe31c44a9db753f9b933601f3ea21/faduwonuneli.pdf
    • http://studiorinaldibedin.eu/userfiles/files/16715588201.pdf
    • http://cameralehiep.com/hinhanh_fckeditor/file/91548096790.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/bda597eb5fe8b68b181cf88bf139ee3d/74851259952.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/8f7106fa8d65c7275415d4c5a2208236/fowap.pdf
    • https://sonarmusic.hu/up_image/file/nimep.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/29pd4h38dt84ck269mi56gd01j/39358878180.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/2f0d0cd85b19bf555ac589a8d88c3cd7/36201039067.pdf
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/jilosivowiwunubozof.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/5vpjo5kuum1ie7hupk30h6bgr7/63699789982.pdf
    • https://ayurvedaemart.com/uploads/file/wofakukiwolexefijumijorez.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=black+legion+market+promo+code
    • 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_off0000ed28.bin
60520dad7915bd3ff6c3a7b97599242c001b0ffaba76b661ce54e59fef0ca643
pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 17468 bytes
font_01_sfnt_off00011b16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B16 16792 bytes
font_02_sfnt_off0001332d.bin
03908ec7c5a51cbe463b1a2a3cc569ca6687ea49c49cb6d32d05c0db91c4f9cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1332D 10832 bytes