Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf1c537be360455…

MALICIOUS

PDF

81.4 KB Created: 2021-08-20 07:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e958721bd88554dd07f488e24f09a08b SHA-1: 2002513a2141282abdfa9ca4fb5474e716131ce4 SHA-256: 3cf1c537be36045582a8c9a9ddf46b78d874e1907af1f548162b7675545fd59f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a strategy to obscure the true destination or leverage compromised infrastructure. While no scripts were explicitly extracted, the nature of the links and the overall detection suggest it's likely a phishing lure or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pixomot.ru/uplcv?utm_term=how+to+design+compensation+structure PDF link annotation
    • http://okudshava.ru/userfiles/file/87636968391.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7a0849d17f295852b4082d25b1bd5cd5/70150564150.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850da7569d1---jovidu.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f03519b3f8e---25571829259.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/10873310877.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/65861773803.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8a1f93dbdb907a882057cbbab16044d3/75482534180.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/regasupijemozulilot.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/5a8d24508eda72a50a041cedc3edd1aa/45741925071.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/4bc772e39a90349c085a21807fcfed2b/zetax.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160747774a6190---vopupidivo.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/vodexub.pdfIn PDF document text
    • https://netlandschool.cl/files/lidubupasetititakep.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/zolelimomuzifumegovapi.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/69865207091.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/41202872350.pdfIn PDF document text
    • http://brukbet.com/user_images/file/9021249567.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b999b20d3de---kumolatozujuzafewupul.pdfIn PDF document text
    • http://redactron.com/userfiles/file/85715533601.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1629087533.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119c624d81e2---21002511038.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_off0000db9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9F 16368 bytes
SHA-256: 3981951cabc9d2902a3dd422888256b7836ea9807dedfb0da3b59a6f3c03bb86
font_01_sfnt_off0001059e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059E 10988 bytes
SHA-256: 1430b92776a36663337ac7bf309d571b6fce859e098725b61f4ced03c87104ef
font_02_sfnt_off00011ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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