Malicious PDF — malware analysis report

Static analysis result for SHA-256 effffc7d7ae14900…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 19:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bc752f0d40cae318702342709d190fc8 SHA-1: ebf1c925f72fc8b5abd39e65b3c0ccb64732bda7 SHA-256: effffc7d7ae149007e4c4fc8913701e4669c347389ef8951d618ed4fab2874c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • 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://ketchas.ru/uplcv?utm_term=fake+gps+go+spoofer+pro+apk PDF link annotation
    • https://rpdev.org/ckfinder/userfiles/files/leruvezoveledewujexatix.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/66978619168.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/jedufewovatowitel.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161425fec5460b---46316268526.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/13652491405.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/33705297355.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/10188624313.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/23346807325.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/mijedipavejedijami.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/94786545682.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/vozibaverevo.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/46612050409.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/16a87ca13bf83355b50ce91d597f5efd/rubitabalesepesisosoligez.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/wozetamapum.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/livuvudabenowoniwogej.pdfIn PDF document text
    • http://megalaserasia.com/upload///87910014096.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/sezufujofufevobaregisi.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/1702640763.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/cff083db70f4d049e299d3e30af7c4df/56532813280.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/jazasawirowiwajusigazatox.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/pubiwazekelukide.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/gujeriwenu.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-6/20210906133237169697.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/42680164987.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/1928077344.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_off0000d7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BA 18672 bytes
SHA-256: 5f11ea64ff3973410cfb68e2141696b8ec73253d4f56384647e3d3645e2a12c5
font_01_sfnt_off000107d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D6 10264 bytes
SHA-256: 8b6d8f16cae51f3fb4611c84f6adec87e89149b5e58f0a8ad3e1fef93871d886
font_02_sfnt_off00011f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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