Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e06d3f9d1517c39…

MALICIOUS

PDF

84.4 KB Created: 2021-06-30 04:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 531ca09104640c769d072ce0f8755f7d SHA-1: 5b5bcce2b0b2d015f17dff532371ecee16ca303a SHA-256: 6e06d3f9d1517c39913b5b0d0d0d4e6724e07e9ff2d6a6147862f0e8b6c2231b
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics identified the document as a link farm hosted on compromised WordPress sites, with numerous distinct hosts and UTM parameters suggesting a phishing or redirection attempt. The embedded URLs point to potentially compromised or disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9bf51cb463111e713600e59d98acc692/kilomav.pdf In PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/21699430481.pdfIn PDF document text
    • http://allasclub.com/campannas/file/faropinozonezinuw.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c062cd118---tibafafinusedujero.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c6db175cd3e---83604113441.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/rujapaki.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210608075455_0l3xs1.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f5b83f04a---59081866115.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/h2bgo3gelof08spuqg2sfb2uf5/getosuginolex.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/vumonutimibixejidib.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/9b8a3806801acfec09404e6274e8bc5a/49805627707.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/57354268891.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/gelozasizupaxofejinabizev.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608551eee5179---givowidujajejo.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/dubopulare.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/4ef427e17b2ce35d20efcd6e6240ba48/90721628903.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160963bc76c77f---wekivi.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/35462844980.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/saxazamur.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/160afc5da54b25cbd4f04f573dfb4fb3/davefusojanog.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be82de97f47---88175546950.pdfIn PDF document text
    • http://stillwaterponies83.com/clients/74660/File/sidaremi.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/34579943336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=to+conceive+a+childPDF 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_off0000e9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 16524 bytes
SHA-256: 51af13f3d89ee495e6bb72917a5dae0e69eed9566653a0cece9901bc73c0c68b
font_01_sfnt_off0001148a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148A 10128 bytes
SHA-256: 9e29f77a1b7482bc99c0555cd1d8f15c3e9e17d93fbc0fae2994fece0e96f5e5
font_02_sfnt_off00012b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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