Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ef7a13dd1afaa4…

MALICIOUS

PDF

60.0 KB Created: 2021-09-24 14:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b6f8e9f0cc2eac09661f7ba3003e272 SHA-1: 88c1d4d452ac3dd761602838df2016a97b28c944 SHA-256: 73ef7a13dd1afaa4a743b7938e2ae01780a208857bd761ce7b950ff9a397c077
164 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. Heuristics indicate it's a link farm hosted on potentially compromised WordPress sites and disposable domains. ClamAV detection further confirms its malicious classification as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4969

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 60 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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://affordableadobe.com/ckfinder/userfiles/files/pidupot.pdf
    • https://hashtag.school/userfiles/file/foworixiwis.pdf
    • http://qianxish.com/ckfind_image/files/lavukesabuwapubola.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16145023ad8dec---51302304416.pdf
    • http://euskararenginkana.eus/files/galeria/files/ginofolebotobon.pdf
    • https://blogsma.com/files/ginoxularezomilotaladi.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e9830d9c85e065a46c40bca6c64005d5/nalolutisukogel.pdf
    • http://polenes.cl/userfiles/file/gefizexazirebabe.pdf
    • http://ylpqzl.com/ckfinder/userfiles/files/dotavejanawuk.pdf
    • https://tpk-m.ru/files/file/63619998863.pdf
    • http://crestviewshopping.abwingsmd.com/uploads/files/kibitagetazenuw.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/dabcad58d3ee4bb7aa002376bcce181e/36809210567.pdf
    • http://ksnjl.com/userfiles/files/bizunejipisaw.pdf
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/27202130010.pdf
    • http://zzfcw.com/file/fkimg/file/tupuvasaledosapuzufojux.pdf
    • https://aitalk.vn/upload/files/jolerakolivopubaxorov.pdf
    • https://k31szmq42-nu28.com/contents/files/46065201359.pdf
    • http://pnalog.ru/images/file/92123654503.pdf
    • http://paroissedementon.fr/upload/files/dunefurovanogab.pdf
    • https://mr-alian.com/upload/ckfinder/files/dimuna.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161410f23e4b8c---kinodalodaki.pdf
    • https://mavibusiness.it/file/dikid.pdf
    • http://schodylux.pl/userfiles/file/2334811538.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=android+developer+fresher
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b214.bin
aeb735cdbd04ba70f6cc1444062270e583d190b4b9afde4366e1b393987199cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB214 14612 bytes
font_01_sfnt_off0000d5e0.bin
d81ea57ec966d670753b73a6facf51843f44b079aa326c27f2764273bce39dbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E0 10380 bytes

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