Malicious PDF — malware analysis report

Static analysis result for SHA-256 c778408f5010ebb9…

MALICIOUS

PDF

83.6 KB Created: 2021-07-07 06:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 110a3039fb5f5cfe052133a065c46b70 SHA-1: 9f146a34fb9e0fb9222dbfb599e91ae2e10afdda SHA-256: c778408f5010ebb9e603663eb5fe36c020a72c703fe8a08056b4bf344334d0e2
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories, indicating a phishing or malware distribution attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The primary function appears to be redirecting users to potentially harmful content hosted on compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/e6cfd6f74f819e4959b98b78be1f5eb9/41072492844.pdf In PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16544592842.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed7f184512---40541458887.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/23707931088.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba79aab8237---jujipofekirezomexesane.pdfIn PDF document text
    • http://krzeptowski.pl/file/fomenukesevejeg.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb169e346f---ruzigemilibim.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098de081afdf---41937836627.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd223d10a93---17873464444.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16096ff33bd13b---wonuw.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/80151621579.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/55546242734.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/javujoletopadaze.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/81390353326.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/heoth2loejkf7v70ilo8041527/39349064962.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788c38e7169---legaximokotimupowigerafi.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/52229978925.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/43799770730.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/95302534958.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/94001887760.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/lowozofo.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/56572672898.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/7549549847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=distal+and+proximal+tubulePDF 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_off0000e174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE174 10896 bytes
SHA-256: c092293c9675e469ea5a9e69e80f9da45536c570ece869a9a9bdfa33c288205f
font_01_sfnt_off0000fa65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA65 17148 bytes
SHA-256: cd1f12db40206ddaa5b468127b85e7ff7a0567ef74332eb0d09e20422f730c21
font_02_sfnt_off00012771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12771 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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