Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ef7f7a8079fb25…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 02:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2ac2f8b91e4174b51899ac4b50c293b1 SHA-1: a6f7991607ade9c99dbdf56be705776da6d16a01 SHA-256: 95ef7f7a8079fb2561453ca2ccdc9f9185a378ae912cdc9c1484682147754d2a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links and compromised hosting suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://instalacje-elektryczne.net/ckfinder/userfiles/files/tefutu.pdf In PDF document text
    • http://laureysnv.be/uploads/files/lepoz.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/piwaribo.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b6f6675df---87842343027.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/rofafowijevupiwupegus.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/selasiwoki.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/90809692377.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/doxofize.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/93725657861.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/kafebutuxomenebejilelo.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/lemaju.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/25d0037c5a3e8dfcac32e988b9142170/pivodoserugepor.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c07ca0fa06---29425765723.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/10529184dfd743963f3212f6b3f4157e/49531539851.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607604ac4b972---gexamoromutosisa.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/nokevutumimofe.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/vusajijaluf.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/kisulirorigisifobedipilaz.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/029cd95e27ced3259d709679d6353780/97355452354.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/golevurevo.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/mexafikojev.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117024f3172e---38282335408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=qpdf+remove+watermarkPDF 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_off0000db2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2B 10552 bytes
SHA-256: e77b56719ac928074f33649fc3a502591ce6b8fd66d0b8323c1dc093a252c9d1
font_01_sfnt_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 18208 bytes
SHA-256: b625bfc5c9dea8f771d61de46d10d8aa075ed53475ce16e92955c1eafdc69da9
font_02_sfnt_off000122ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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