Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7e0e51629a7b8c…

MALICIOUS

PDF

79.4 KB Created: 2021-10-05 01:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e40674245bc47da49b9273eb314e9b80 SHA-1: adaa5d110bef028ab47e80ff915f67841270601f SHA-256: 1d7e0e51629a7b8caa273b18d724ed36395d66d02cb53d93500439f3709db44f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure, but the presence of external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://equimat-cheval.fr/file/natasarexivojibotaliru.pdf
    • http://studiofapas.it/userfiles/files/15843646239.pdf
    • http://studioingegneramato.com/userfiles/files/nateparagisikewozuxi.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ujv4pevcjr2g9qdf2ilkdegv0h/wuvamabowiwukexov.pdf
    • http://grupposcorcia.it/userfiles/files/sorugakimizoden.pdf
    • http://kzlo.pl/fotki/fotki/file/62916899622.pdf
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/gesemodabonado.pdf
    • https://discovery99.com/userfiles/file/42274901527.pdf
    • http://travel-door.com/userfiles/file/ribetegowobamebanorugex.pdf
    • http://yyfxsw.com/upload/files/sipawineredutixopapakina.pdf
    • http://museodegliarazzimarsala.com/userfiles/files/zeminopubojige.pdf
    • https://nabil-doukali.com/userfiles/file/sedizi.pdf
    • http://electriccityusa.com/images/fck_uploads/file/lijotivon.pdf
    • http://mrcubezpieczenia.pl/app/webroot/media/files/88478755423.pdf
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/88247219795.pdf
    • http://abbwingslynnhaven.com/uploads/files/joboramera.pdf
    • http://autowassenindex.nl/images/uploads/79395236066.pdf
    • http://metrocars.london/survey/userfiles/files/18453588344.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/kelekafe.pdf
    • http://greece-ex.com/images/blog/file/bavabunevukuwuvugududoj.pdf
    • https://hohsingfiber.com/ufiles/files/sixizomobanituxabin.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161407381b4757---39583801988.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1fa3985b7---netanira.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=best+baits+for+smallmouth+bass+in+spring
    • 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_off0000cefc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFC 16792 bytes
font_01_sfnt_off0000e713.bin
2ae3ed5d7c8330950208272e08ead560f57840bfc89fd4654c6ba3c573ba9173		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE713 11096 bytes
font_02_sfnt_off00010094.bin
6e0a4c39a1c02eccbf57d0fed8394784ba6bc143b107031f8277d1ccbb794ccb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10094 18168 bytes

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