Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5bb99e412d356ac…

MALICIOUS

PDF

69.8 KB Created: 2021-09-02 09:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 30421940a8b5d257d125971070678df9 SHA-1: f54937808c08a4bfe3003e34172f4846aefc5d4e SHA-256: b5bb99e412d356ac7cb7ebb7a1809988988345766c776d3b6a24c577ff2d154e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF_IMAGE_LURE heuristic indicates it's likely an image-based document with a hidden clickable action to launch or submit to an attacker-controlled URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://nomylo.ru/uplcv?utm_term=enzymes+notes+pdf PDF link annotation
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/6213962822.pdfIn PDF document text
    • https://bem-sa.com/img/file/jezefexunalivof.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202106221734594892.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/xajuvewoxakuvapoju.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/2969998096.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/tudosuta.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/jurukaxosixiserumibadoxe.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/tirozigufan.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/f48f58849ba13b8add752eb6334f55f0/xefaxafexurilinowonejewev.pdfIn PDF document text
    • https://andana.us/files/files/levizekidutebulepijav.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608054e19b8b9---sitaviwonamefegoxixamafij.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d83e2f42bd5---zemomujas.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b862e9dff---zomugawuvasotozovuve.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/15686733281.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/47241437615.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab312395a58---98222385443.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/68724064987.pdfIn PDF document text
    • http://planetamama.ru/files/file/wiwakipolexom.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/mugoroturazo.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/86923243415.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/2d247d6237b0fdcdb21d8d758f7921ab/20913800424.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/kifawimimamalajasukaxutuz.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/52675533526.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/52337463077.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/puzojavogerorejakenuruki.pdfIn PDF document text
    • 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_off0000b735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB735 13940 bytes
SHA-256: df1d1fdaf111122d4ebdaef44000f3d41736eefaf33631ae84feef0b81cfb0e5
font_01_sfnt_off0000d977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18E 10416 bytes
SHA-256: fcd9a719c6971a77d3fecc04a2813d636a075454e24922b0ca9e6953bbafa7d4

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