Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff20ffd86bbf6f4…

MALICIOUS

PDF

84.9 KB Created: 2021-09-09 22:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cbc107e322ad662cbac9cf2387e98eef SHA-1: df8c7e2b0cc7221a805dcf1cb26d407cb51b626f SHA-256: eff20ffd86bbf6f4bc18382e969dacc33ba87e3cabd9185c2a7ffe494a9e98f5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the document's structure and linked URLs indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://adtw1.com/ckfinder/userfiles/files/61356057986.pdf In PDF document text
    • http://actinq.nl/upload/file/vogedanelifefovejed.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/nijemajofifidaxol.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/zibobavomomobiwutif.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161370767cdc76---rafodezizike.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/26042621789.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/54281683345.pdfIn PDF document text
    • http://nscenter.cn/upload/files/31352386962.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/toserovutupupenuvox.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/buzidusixi.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/gagoxuxowaxi.pdfIn PDF document text
    • https://ferropula.hr/files/36120097494.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/69212776032.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/8136636098.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134c210e2e80---19749652510.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/34140038142.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/031527289813.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/todetuwutava.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/4004c147b7d10fd8938e1938ecffb0cd/fegutukuguzuvejarejosin.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/lijikusebikalomapedilod.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/xuvopasumexibiladix.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/tuzerabopupamebu.pdfIn PDF document text
    • http://texmet.pl/userimages/file/mibarulubulul.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/10682925668.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d3f22562e14f0275bfc4dbf048d88181/66594346371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what+phone+is+better+apple+or+androidPDF 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_off0000e785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE785 17748 bytes
SHA-256: 494b8b60b5cb2a2e47624f4051a7f23ad76a0070e17fd3b2ce7cfa0d3d82c7be
font_01_sfnt_off00011612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11612 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E29 10624 bytes
SHA-256: 8a8e255f4d57fd78dc36507b67649bf8aa659eb146c9e526b38a215c812df260

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