Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb4cbc009247311…

MALICIOUS

PDF

76.8 KB Created: 2021-09-04 03:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cc52b414f5e99b7fb5d83cb661419000 SHA-1: f05300e07bb6e2bcca66cbbab9d08df4644acd2b SHA-256: ffb4cbc009247311d3cd57170eb3bea2441cbd5231cfc893d228c593f0406438
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting. These links form a link farm, a common technique used to redirect users to phishing pages or download malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://altinay-law.com/images/file/94856740114.pdf In PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a6bba25c---78762115035.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b7e534f4f9c16dfb2b50ebabc740d065/70601130394.pdfIn PDF document text
    • http://imi.vc/upload/files/56705121840.pdfIn PDF document text
    • https://actor-conseil.com/files/file/65624229350.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/80680484023.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/zumokanovurujurozezigupif.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2a4c12e4b---volugamabeserejis.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/31661425218.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/19599759724.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/16599971995.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/87645265578.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/mibefi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8017daee38224a9cf35eef838c3b9938/71172327321.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/sakofokimoxetegufizeli.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/59606667766.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/e78f989c12be03b2f1f50fce5ee95c23/dagom.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/19ce0c322450cd9f58aef5b4bd238d37/mamofubad.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/temed.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0671e4ba72---xibawasasibibaxixoteb.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c68e6c22a51---tagamejixibere.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/22807287435.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c994611b367---nokez.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/jomevi.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f835a7ba---93967490556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=bohr+model+of+an+atom+worksheetPDF 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_off0000c6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B4 10756 bytes
SHA-256: 5e2fd5e1794d487c48e3b822ad985e7b761122e1ce201264ab7a8fda346eee9a
font_01_sfnt_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 17840 bytes
SHA-256: 1a7f6f5fb3f2627ca40c57a97a396fb7f5a0729e8e9ffdd8d2384b4845489dab
font_02_sfnt_off00010d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1