Malicious PDF — malware analysis report

Static analysis result for SHA-256 b07988853593f49f…

MALICIOUS

PDF

88.7 KB Created: 2021-07-19 01:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 92c31fb6e8cef415092a26a02b18b975 SHA-1: fa6e5ddbe8bbc57cc3cfc81688beb5f872967d77 SHA-256: b07988853593f49fadf6af5e46a2d678b27da4971be8c8ea4848b3d6a5a7d167
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of a link farm pointing to compromised WordPress uploads and disposable hosting suggests an attempt to obscure the final destination and evade detection. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3658

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.
  • 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
  • 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://srsheicha.com/uploadfile/file/75398879547.pdf In PDF document text
    • http://wsp.pl/userfiles/file/vegimiguxudiwezopil.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/gau68kvj9rot01qr41jnrtsbdo/63849314917.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/bipexazetomeviravudotugaj.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c484623a18d---34799527474.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/kanosewatuxi.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986e3a3e1a2---ravibebadojezuva.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/30816595541.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051003560673499.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1dd9e2414---63753356132.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/84058612667.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4b66f9df646d56db5cf5e4a0e2ecd98/71831128450.pdfIn PDF document text
    • http://nutrisoilvietnam.com/upload/files/mogexeromexax.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/efb54e49ea59b90adfc201e3dc889037/zefezuzuzatiromovokil.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/pededekiwukopemixi.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc200d93487---xabaxuxefejekikarer.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/73845972596.pdfIn PDF document text
    • https://tipresentoio.it/images/file/45880802694.pdfIn PDF document text
    • https://stopserv.ru/files/file/99726061463.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/gupoze.pdfIn PDF document text
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/ferazoxititinunuge.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/tikomorino.pdfIn PDF document text
    • https://irrisyst.eu/files/file/sesomoxatab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+convert+pdfs+to+one+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0E 10456 bytes
SHA-256: 549c2758113ff88a85f02f6b9785474a88b8e738307b5b4cdfdae64c430efc93
font_01_sfnt_off000125ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EC 17604 bytes
SHA-256: f8f3c336d284119906234c0dbea3f659629185a788728ddcab48140101e789eb

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