Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade6813b45b7f69a…

MALICIOUS

PDF

81.1 KB Created: 2021-05-29 21:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 894c054985c405541443259591dead2c SHA-1: fb7f90116cec292fd33ad9289d50cc6b0669689a SHA-256: ade6813b45b7f69a004e73fed9421d93184733593029b80db41e9400a40b95f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to redirect users to malicious content or phishing pages. The presence of numerous external URIs and the 'link farm' heuristic strongly suggest a phishing or content redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ketchas.ru/uplcv?utm_term=moto+g7+power+android+10+problems
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071104b9ac70---vokamiredukoto.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-5-20/20210520022948462430.pdf
    • http://nesthomes.in/userfiles/file/52266715277.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3934adcb5---tixolorugikevuzijosuwolak.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/n8kfq0et8l1lsc1jilfal0amq5/pomobejiwejizowug.pdf
    • http://kardelendalgicpompa.com/uploadfiles/file/wunozuradenegataletujaf.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608887352cdfe---xejugozenodijimi.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/45k9sml129are1dfojm01bp3l6/taxodalipudibugipuwavazo.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/2dbe829bfb4b81ea289da595df7b4758/22950997846.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/g23kmu90sljomi2qbfnop98ips/54327327828.pdf
    • http://amadpich.com/userfiles/file/92877988348.pdf
    • http://ikhmongol.mn/ckfinder/userfiles/files/biwuvefi.pdf
    • http://ats-dz.com/userfiles/file/84078094090.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/26890c2d80451d8a7792f11b8810626b/27921284406.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e7dd9ee98---27658040032.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a95f5b000fc---60318081741.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff73.bin
fa3652b63f522e989b32f6beb8bba0fc72f20de40699ee7fb9a2c982a3efd576		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF73 5788 bytes
font_01_sfnt_off00011332.bin
0bad54f29f866ee2cf37ca0463dce9b3324a22f35b4468da01ddbb0717b93295		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11332 10560 bytes

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