Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39fc96453f25ba9…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 08:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b087e251ef38efdee158095e5613d66b SHA-1: d485c347879623e058b7e0eab9f41f9d228d0d61 SHA-256: c39fc96453f25ba935707444edfd9004d2781b20b6f0ff1a4fbeb2a99e9114b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan distribution attempt. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of numerous external links indicates an attempt to lead the user to a secondary malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://laborke.ru/uplcv?utm_term=fly+me+to+the+moon+with+an+original+rap+verse PDF link annotation
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094134f06120---16735458450.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/1f2vq1fmv2t8q0na59ufauimdg/12321571907.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073a84bde01f---fuwojofokebopebu.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210809020319.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/22d9e694d08c031b1db36ddce1a81c16/48827548147.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/17766530349.pdfIn PDF document text
    • http://bronia.org/userfiles/file/41792991271.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6ba7e5b33---56014000320.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/90800487227.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210603142034.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/8763cf9f198c406b67f221a1fe4a7401/baxolifoxubilogaku.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/93242130931.pdfIn PDF document text
    • http://capital96.com/userfiles/file/7461753192.pdfIn PDF document text
    • https://ksboutlet.com/file/files/pejiponizurufazopuseruj.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2011416db6---64753617217.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efe2715665b---xejadirunuforo.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/1c1ae2f9ac34d3e01f81496e60708975/ragofamerabez.pdfIn PDF document text
    • https://citytrafik.nu/images/file/gefixumupokelanaxegaze.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/jimexen.pdfIn PDF document text
    • https://avenue102.com/uploads/file/88362821526.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/2080237906.pdfIn PDF document text
    • http://odumakus.com/uploads/files/89595582387.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/33863135627.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/tunuladibinuvorab.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE9 10940 bytes
SHA-256: 2c6d8fac40ba2ab3014f122ec69d159c493b31864183fdf6b06a1b611af1649f
font_02_sfnt_off0001051f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051F 19964 bytes
SHA-256: 90d677b8346bd8f9f1131db6bff371658e71808aaaaeb425bb6c2563b37a8de9

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