Malicious PDF — malware analysis report

Static analysis result for SHA-256 31017c851a693337…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 02:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 42a5ff649b2a9be33460106e745cb2af SHA-1: 42886e2c68250059f5a5263ae65300f3894fe088 SHA-256: 31017c851a6933378270da38900910af2d7c692429a57928d8bfb2d841372268
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to potentially compromised websites and a heuristic firing indicates it attempts to lure users into executing commands via the clipboard. While no scripts were explicitly extracted, the presence of embedded URLs and the clipboard lure suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://laborke.ru/uplcv?utm_term=upgrade+to+latest+android+version PDF link annotation
    • http://nage-z.com/ckfinder/userfiles/files/wonitopaxudapu.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/rejefekex.pdfIn PDF document text
    • http://sinostandards.net/upload/files/51175977404.pdfIn PDF document text
    • http://czyxchem.com/upload/files/47211363095.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/46804172776.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/pozosodagoxoxodiboki.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/0vpvecof49kp4jshdhjh6lsir6/67990392903.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/39787359349.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/lotanapowubunavepubol.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/916ac866a731bc56b723b143138c5703/zuzumakamuvowunemagadade.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/xugejosapokudovetovelozow.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ef857bc53---31160832372.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2b60894ea---pukedaleta.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/xepifoziloxemarekorodo.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/38186570213.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/pukazede.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/51090561774.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebf4e8a68f---wamulavosulomotivi.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/sevojetosoxuxenabirebagot.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/8453afa0336ae6235b62c29599ad7bb9/73557812362.pdfIn PDF document text
    • http://chamdure.com/DATA/files/7949565631.pdfIn PDF document text
    • https://jensbrode.de/files/file/ropenojugizetakuwa.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/mubumoviwiluza.pdfIn PDF document text
    • 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_off0000dd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54D 19244 bytes
SHA-256: 18edcd3e9eb8ff2cfa6b9d7ec9d34eda1b78c7b62e32512ae385bac8577b24ab
font_02_sfnt_off0001279e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279E 10640 bytes
SHA-256: 75bca1bb48c385e734ee2b9cb2facdc07017019ea6f5c85af0e0a06f07968e17

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