Malicious PDF — malware analysis report

Static analysis result for SHA-256 6426540d11c22fd4…

MALICIOUS

PDF

100.1 KB Created: 2021-07-19 10:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ec1bffa6311e3905b9c1ad73eba56c2 SHA-1: ec96f5d16e9b90e074827a143896c06c142588f6 SHA-256: 6426540d11c22fd40025c243d4bc1bec979a1b443247920548808b2d0bd7db57
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these compromised sites, which are often used for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/edbc4c800805f91cba2b12046f8d37e8/94362603983.pdf
    • https://acgroupenterprise.com/userfiles/file/fapoleziguzaturujepupapa.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f35053acb---55790308570.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/69je7nq328055piavfe8etud31/busubobuzozij.pdf
    • http://nuovartea.eu/userfiles/files/xokunifupurosov.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/junuzison.pdf
    • http://agisma.ru/files/pages/files/86663647704.pdf
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/jobolidemule.pdf
    • http://ahcxdq.com/uploads/file/30010733243.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608062c656fcd---95483216223.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e3bd5dae6---79124962844.pdf
    • http://accessiblevehicleservices.com/userfiles/file/77259706205.pdf
    • http://infinijewelry.com/userfiles/file/xoxosixedibalemiges.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8afd2c70f7---kabomipogupopigaxevip.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16098900ecfdf2---vadezajovojudituwigi.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944064ec0a2---rigasudedimikavomi.pdf
    • http://cuoredicane.it/userfiles/files/pipamuvajunesupititisema.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/84670958529.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/jvrkpubd2jspnn2a1ftt4ov9gl/42566795901.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086830990996---58160361824.pdf
    • https://llsindia.in/FCKeditor/file/naxavowek.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770f550253f---85696489836.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5290757fe1---jonakigisabobemipefebojix.pdf
    • http://inncredel.com/uploads/54701398179.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/8212c907dd34860615bca127ffad4c6b/biralufa.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/4ca76a17156c5278787f62b251e0464f/fifesijuguziwiporelajatan.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/db84124ccf315bb4af4a8cecb01b17e1/9933387787.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+direction+of+magnetic+field+around+a+straight+conductor+carrying+current+can+be+determined+by
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010acc.bin
81ca45a0f0cab2a0ef464b957b9896065a199a037fd9c17f60e9fd15b36fa9da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACC 17728 bytes
font_01_sfnt_off00013951.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13951 16792 bytes
font_02_sfnt_off00015168.bin
f6f00963d916faf6c14cb3ad43363ccf51aa7927b85691ba7684028d2fe47e08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15168 11240 bytes
font_03_sfnt_off00016b5d.bin
1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16B5D 16168 bytes

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