Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c46ea368f6d65e1…

MALICIOUS

PDF

79.8 KB Created: 2021-09-05 21:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c94b80c9a606f2f01a454d069917c830 SHA-1: 523c57cd18d5eea4bcdfb00eaf8b8e5131a7d3ac SHA-256: 1c46ea368f6d65e151f1061bb771207f22486622cbe3963537371a9fbe4f819d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://medvor.ru/uplcv?utm_term=area+of+triangle+missing+height+worksheet PDF link annotation
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cf3111924---17835591423.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/xinadepudefiratifira.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/buginosi.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/soruna.pdfIn PDF document text
    • http://fedoro.ru/upload/file/bojixasevofoduxit.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083ddf867974---jelasubogo.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c62e186626e---vilebagidewe.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/doduvatuduri.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/bojiwilutatavajobap.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16285513581974650496.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e664e43afde---3690133921.pdfIn PDF document text
    • https://activepymes.com/pub/file/62620251994.pdfIn PDF document text
    • http://ciskmv.com/css/file/taresugebum.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/87267126532.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac69d87311---jurujemuwipegam.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/xunazijusevogoti.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/83786502037.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/3702689dba564177f77eeab9fb0716fb/84143439800.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/metini.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab927b74232---98678953877.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/7e1vth3ovhp414ok4a8lp51haf/68588405222.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/3e4f1bedfae19769deaecf7dcce9bbc2/rilawipasewigu.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/loginiwivosakijemebete.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_off0000d167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD167 10820 bytes
SHA-256: 6153045e195501289b26a256f322418e0c04618213bc48de734c4fb2d2985df5
font_01_sfnt_off0000ea40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10252 18248 bytes
SHA-256: 9068ee112f28dcdfbdbbdb7edd13edabdc0d3bcda542f95f8f7338108c5d29e0

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