Malicious PDF — malware analysis report

Static analysis result for SHA-256 c54afd73cfa10748…

MALICIOUS

PDF

90.7 KB Created: 2021-09-01 00:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8fec8c6548003f5e7e980cc248e660f8 SHA-1: 26d24576decb98dac5f381bd857bd98a7357383f SHA-256: c54afd73cfa1074821845881e9fc6bcc3b4cb91a158a0997323051c3cdb980b0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, with a high confidence score. The heuristics indicate it contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic further support this, indicating the document is designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://catamma.ru/uplcv?utm_term=please+confirm+receipt+of+this+email+by+replying
    • https://hamzakocakoglu.com/userfiles/file/41339419816.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609187cd3b0f2---40725982881.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdff5cae08---nosurijowoputos.pdf
    • https://mamadona.ru/ckfinder/userfiles/files/gozobilijo.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/cb0c3ae84312a4c191949e977e11ca44/39741558683.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa221195166---37193442770.pdf
    • http://kardelendalgicpompa.com/uploadfiles/file/vitoreg.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088c2b0639dc---tokagudako.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/423ec380f077d193625c2429a02facad/jevenavima.pdf
    • http://simonhoirup.dk/userfiles/file/lomobafelarunijisarobofa.pdf
    • http://telesson.net/_UploadFile/Images/file/domodafetelilomirawilen.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8a7011162---wawigodalumujafuzokob.pdf
    • https://aurorabersinar2.com/contents//files/mufebipurosa.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a352ebfbbc---disogidanaxojon.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebb114a895---95326619646.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/be8b0b35045268b845a2e042a397c54e/71746268402.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082817eabbd5---3089131498.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a793b03545d---wedezewipumomatemifepi.pdf
    • http://etasystem.net/userfiles/files/92412282978.pdf
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/sivotelegogesugadabiru.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/h217ogurcllch0gjtf1nustmg1/pozonixigivizirerikeg.pdf
    • http://businessvaluationapp.com/fck_files/file/82736160821.pdf
    • https://hosvagyok.hu/userfiles/file/87393696994.pdf
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/32096846241.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9233764c0a---65740061254.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA36 16792 bytes
font_01_sfnt_off0001124d.bin
acbd5161bf67643c99a481afb7daa77076d1798638f9ae130cb7e6309053c273		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1124D 11184 bytes
font_02_sfnt_off00012c11.bin
77c64ea37d0008ec6f69fcbddce49a5fd28745ced2e15d0075d8aa46674d4ddb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C11 18488 bytes

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