Malicious PDF — malware analysis report

Static analysis result for SHA-256 290f7d29c8e7dd60…

MALICIOUS

PDF

102.0 KB Created: 2021-09-04 10:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f853df322a83f578ca34049eb008fd57 SHA-1: 0bae3f5abc221cc18aa1e268abafdc5991d40c5f SHA-256: 290f7d29c8e7dd600deb5f399a1cc59b5856c4cef53e33f8258d8d12be27ea75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, suggesting an attempt to obscure the final destination. The presence of these link farms and the overall structure indicate a phishing or redirection attack designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://thefertilizergranulator.com/d/files/nijovixutixubevenogewim.pdf In PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/bezaxujolilofij.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/97083200628.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5fcfacc9a4---68637856549.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78ab29dbe2---14158284942.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/n3971gon7lcjejb2h8n675k6e1/32657752654.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aad533cbd0b---mimis.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098fa66aa8e5---gujiwovosavanapuxameg.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/vurajaxugigunobekolobig.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/lewumamaguxutujezajerem.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/fowarakenibivirawipupo.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb822ee0d7---22038163067.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/reresipitid.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc2c3c9f8c---lufowuvotomoluxuliwom.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/e5s3ha1hoc4ob1lgomkmb4pgh3/fomovoberafadojixaka.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/86380235525.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/a3c2n6f1li2s80r6i50crhkrtg/84062914936.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/lorisubilanaxusita.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/97496557361.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/18778095517.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc54c521665---kuvegegogevuxoga.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/92837574239.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/18595444913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=django+tutorial+python+3+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_off00012133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13945 20628 bytes
SHA-256: 0a6f36d154caba8e1df86257139a5c44192c038850edd9808f478aafb40ffddb
font_02_sfnt_off00016f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F9A 10992 bytes
SHA-256: dc41ef5e05db66ad215102491a21a06d0603d7c26a2f5dcdd583cc2cd50b0863

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