Malicious PDF — malware analysis report

Static analysis result for SHA-256 3126133d049e1ab4…

MALICIOUS

PDF

85.0 KB Created: 2021-07-06 21:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 88951f32bd7c88cc39624d85a16ce325 SHA-1: 19c1d7b0d6c0eb7316d0a2f0824aa33e97357190 SHA-256: 3126133d049e1ab4a75fba477a1b769b05da7527fc2cd9c742ca709e9048034b
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4647

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 https://inwebjor.ru/uplcv?utm_term=eastern+europe+countries+list PDF link annotation
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c82ce032d---lukusivozexuramonu.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/menawojuzefofulelapit.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/40258168848.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/29348504885.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16088611862694---71091682704.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/99470060511.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b109857c48e---nazopomepifonenekur.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/tewupafudemir.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/8a6sfttbhgb30u8qkq16j0etoa/87343112192.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160856da540181---gixepelit.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757a354072a---rajejefade.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/l8kpbj57uh2kuah1pp3qfkpfnm/xiteberepesinefozadezaxa.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928ac75e446---83531709764.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/getiloxiboboja.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6747fe78d6---47767763452.pdfIn PDF document text
    • https://t2sc.me/userfiles/1389614134.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607198606eb39---11612813959.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/c679b210cf8e6d272ded97c9911261da/rajinoxatodu.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/1ee69ondb40nukb7pb99720785/sepagumuvoweb.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c1sc11dgjbv49ffq01rg5pqb27/81834507304.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/0bc0969ae9c5afef54e88469bb10bf29/lejitilelopigorawiro.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/3c3bb99de88ef0c88ba4b7003f518b21/pisanobogomixa.pdfIn PDF document text
    • 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_off00010746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10746 10448 bytes
SHA-256: 4c0e8cfdf476aa60f6786393de6d83a722fdeb80d99b4a6692e0bb3663d1b9d5
font_01_sfnt_off00011f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1