Malicious PDF — malware analysis report

Static analysis result for SHA-256 741875f28d12e1e7…

MALICIOUS

PDF

75.3 KB Created: 2021-09-04 01:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77f62c05d17c4c203b4df8a44195410d SHA-1: b9a3f59eaa9c8cb14d3d3195c474c2333dcf0d1b SHA-256: 741875f28d12e1e7ce865249fb17e08a63dc4be50fb9ab2b946db51c153035af
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many hosted on compromised websites or disposable domains, designed to redirect users to malicious content. Heuristics indicate this is a phishing lure, and ClamAV detection confirms its malicious nature. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=flow+cytometry+in+neoplastic+hematology+pdf+download PDF link annotation
    • https://art-eria.pl/mandarynka/pliki/files/58191907556.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/27804212463.pdfIn PDF document text
    • http://madison62alumni.com/clients/e/e8/e84cd6a5166dbe8c5f6852bff763f4b2/File/82288239520.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/67811425391.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160897963db226---bivufevekedafewavefivesal.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/50771754526.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/tobovokatum.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/felebinez.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094580eaef60---lukedaxunoda.pdfIn PDF document text
    • http://robinsonfamilyreunion2021.com/clients/7/77/7769cd5c98d63cfb9738ae2db1c5c42c/File/65673376808.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/75111072490.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a73242ec0f---24722144123.pdfIn PDF document text
    • https://bem-sa.com/img/file/disomakozigisebizowasoje.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/2vb9ef0401vskp2jq66lhkvka1/46493498392.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/f7b58f58c562c9b8e26feb970184fe61/93215434199.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/2fa25acdf160574db8ce4101cbcf1c39/58528869887.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/nanowojod.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/bl107tk1k3enf0vgtva7bk6e5d/59726737976.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/sikizajuxapezufa.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/41905931178.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/1777191134.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/80673284209.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/36521703434.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_off0000c1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A7 16840 bytes
SHA-256: 50efe66f92a3874f51bc7f176436d3070ba8b47accf34183754e5370bd195f44
font_01_sfnt_off0000ecdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F6 11244 bytes
SHA-256: 7601ed7aadef92fe1446bd7636478527797b617e0fe0f1c9cbcb62926175cba3

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