Malicious PDF — malware analysis report

Static analysis result for SHA-256 056102f51631c457…

MALICIOUS

PDF

80.8 KB Created: 2021-08-11 09:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9988dc6ebbd9fdcb3a1a14501b1c106e SHA-1: 5a922c8a37f12f9461d00b1afc309972989f9492 SHA-256: 056102f51631c45745190f84339b60da14fa513c3f53119cc0ba01cde88caf8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=what+causes+briggs+and+stratton+engine+to+surge PDF link annotation
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c406182e02---75322986498.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fd477ae293e---74220558719.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/697932189i0b4uc1k00dq43m5v/22758636219.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ec6eb74eb---lemifixuje.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/50028788485.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609858961f4b2---goribi.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/dipaxunimud.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/81346495720.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105ef9277896---63715623216.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/kijulemolubabujuzu.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4494f3869b0a0a7ee99cdb82d1dbefc9/gesowakerivedakiwuxakojum.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4921b0b62---80149143192.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/pafofagas.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/dofinigaronaxevunavox.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/bikirolelaluriwirasajadim.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/62875395071.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ituqamqgrffnrstfvka5uku8hs/jinorikixenasakitexa.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160e88ed29141a---7930067573.pdfIn PDF document text
    • http://www.bash.cl/media/file/76557706595.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b77a1571ec---bekuwozewaxepujek.pdfIn PDF document text
    • http://thongthien.vn/upload/files/maguwuberemadefod.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/16314784705.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/43f66622b9542d291f4d35c98efee634/99287000029.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_off0000d67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 10836 bytes
SHA-256: 56b848aec277064c846c5084c2a4d225a7470fc53da0376320111cd181123074
font_02_sfnt_off00010759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10759 17464 bytes
SHA-256: 754eb2629a25fba72a15e69780e36f879fb0daa039f4595b4a535c0d3b03451f

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