Malicious PDF — malware analysis report

Static analysis result for SHA-256 30cf60b92e236106…

MALICIOUS

PDF

88.0 KB Created: 2021-08-11 23:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3608af84787b59d9ff85749b510ed827 SHA-1: 897e058d5176d92038a5a6274d8cb057c1d53fec SHA-256: 30cf60b92e236106c900daa8bf9d1d23b4321da0331143bf318707d4bd0d3237
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. Heuristics indicate these links are designed to lure users to external sites, with one URL specifically mentioning 'grade+7+maths+pdf' as a potential lure. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=grade+7+maths+pdf PDF link annotation
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb02420a75---92040934313.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/47591810324.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606d65c320de5---lewalin.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/d1n7e78mdpvjm1ih9h783ift06/bareg.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/kumovuzomubarega.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a5833faf2de---xumilidepijanuduxuxupu.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dafbc034b16---64673700336.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb7c9d6374---fisafoji.pdfIn PDF document text
    • http://otczenacts.com/media/files/56641068133.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/cbb12c845e3c4e3d4c51f8ba2d84f76f/25414947874.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/walelenafuloferemeda.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160fc726deefd9---40486772860.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/tanijimivemuwurekexu.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/jetoxusaxibupevemus.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/meribosizazasosisitoxaz.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/meboz.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/29791247567.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/9c1cbeb0c0f1ed42da875de8538caea8/namovagosexinitek.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/zetamerepodowofuponizima.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9ab727c18b7c6de1b64fd5517a8a3754/21895186972.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/5037c65263a28041a1c245d09a621575/32908325584.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/32325071753.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e7f04ff7e---73831752758.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/sivariwewujopuxetiwuziso.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161059c497dd5a---juwumikupuda.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_off0000f578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 10492 bytes
SHA-256: bea520a6daca64d1ef9850e67fd9de1b8a86a57cb45dc178116600d86e0089af
font_01_sfnt_off00010d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D69 17236 bytes
SHA-256: 10b110c76302aee34ce9311c692eba4d49883bc1a08f1efc39b270f7037a712e
font_02_sfnt_off00013a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1