Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f6f4cf4104cad2…

MALICIOUS

PDF

78.3 KB Created: 2021-09-01 11:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 88612e16adb15d9138e54540c57e4569 SHA-1: 238abe5b89ba25bee4a827df807d4e1f2995dc93 SHA-256: 74f6f4cf4104cad2b41a2ce3065fed3179fb4f995e03b761c9d83475281ccef9
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document employs a social engineering lure, instructing the user to install a browser extension or update to view content. This is a common technique to trick users into downloading and executing further malicious payloads or to steal credentials. The presence of numerous links to compromised CMS upload storage and disposable hosting further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://maschimaurizio.it/userfiles/files/mumoxifaxagobijodal.pdf In PDF document text
    • https://carsen.sk/editor_uploads/system/files/najaliweleked.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/88252452558.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/tevew.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/45735558708.pdfIn PDF document text
    • https://t2sc.me/userfiles/77256526126.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/jotibexorakuxisipusodijib.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/0na322vrqb9j4qhd2q4m85qdeq/16149362346.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/7ca3b1a0d2a3fb90381eafc45245d1a1/wopobavos.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/2a29e459442ad73a8b25da954bd26861/80944368544.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/ramudifoxejawanajigonuzo.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2044d2f7ec---23397877498.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc59b4146ef---pidexiramufuzepij.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/zelamib.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/072201518875.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/hqus7203a6gqgicmds0e6ie66t/jatalegapekabunubedorivel.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/sinarovawigoj.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j1lr7lnto8ocbfc20anr5iui93/fomipowemetidoleno.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/tiwal.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c158babf97e---69242409446.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/97694183167.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/pinig.pdfIn PDF document text
    • http://0vote.com/In macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=research+paper+scaffold+worksheetPDF 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_off0000d17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17E 10744 bytes
SHA-256: b235818a13fe5c8c6fa628386fd1a99434c133586d948686e259fdf0c22a97f6
font_01_sfnt_off0000ea75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA75 16104 bytes
SHA-256: 87cc992fdbd5b6d129247b18e12d3dc620d1941afb61638517b7bcb53204e540
font_02_sfnt_off000113eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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