Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c2fbe3d5cde75b…

MALICIOUS

PDF

86.0 KB Created: 2021-08-13 12:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0e4cfc0d383036083a71201a980ea4de SHA-1: 550dc1f5824305a3db94d9b483fa42059473e457 SHA-256: b8c2fbe3d5cde75b4de60f3b87b6513d8f27a113bee08486a28f5915d85110ac
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16091c3cbc0f6c---xuxunamoxokawowiki.pdf In PDF document text
    • http://rheinmotel.com/userfiles/file/86716998273.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b09927333a2---gezefozew.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/jijujuxosugeg.pdfIn PDF document text
    • https://stopserv.ru/files/file/ledozupunikaj.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3f6d44f59889f494e19c9e256c5210bf/sifezelinekapaxiwut.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/47471862902.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/niranixoxu.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090f59557332---wajeduzofi.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/536269hn4b1h45j1e9bh9s18ta/fotademiv.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160970f1c5ace6---58242598171.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a724fb221a---zowebamop.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/b9a165e4c8583e285c5192c423c3ee0e/zanaxakaxatez.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/f65oh2clotvg92lnqsfrcjeacm/tubegawatosatoki.pdfIn PDF document text
    • https://beliangka.com/contents//files/zoferazevoledam.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/56608872991.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/47847544382.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/mujixedabuzerevotare.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/watujak.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/2d534a703d2b9a033248e234877cdaba/dovajotexibugo.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a717327d4b5---genolukotidod.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c315c047497---85090645665.pdfIn PDF document text
    • http://ashioke.com/images/library/File/21987487957.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/dv0duhp2tj3v82jlcq5859ftn2/10384976710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=jogo+da+m%C3%ADmica+ideias+pdfPDF link annotation
    • 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_off0000eb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3A 10668 bytes
SHA-256: afd6ac6335b9da147e0ac7a87fdf6542f0acf2ae080e71eb198bdd65da360054
font_01_sfnt_off00010371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10371 18360 bytes
SHA-256: f3861f331d3ee2ca3d146b9fcafd91d06eee3efaccb4389a3d4bd17d5425da58
font_02_sfnt_off00013051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1