Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1f6488e73c3330…

MALICIOUS

PDF

142.3 KB Created: 2021-07-06 16:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c0a8b57f708206ecc50e88b094cc6ba3 SHA-1: a219abcf516e8b68429ad11b16eb9686e761e96f SHA-256: 2a1f6488e73c33303e7a9351e4c67a2804ab62f0fd9ecd04807a054ba3586171
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://ms01bet.net/contents//files/gowuzepamidu.pdf In PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072e1c9afbbb---voripivapirutewisi.pdfIn PDF document text
    • https://kildevangen.dk/files/90738147861.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d811a07cd1b---xekidulegepamaxirowakexaz.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/12327662506.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608046d233f42---84258438463.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/80001178780.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16093b45d6a85e---kasanosemunobevovu.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/j11cli9clg1fcoo2ft4bidnu2c/lebinosafuriwazurabas.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/7553c2bec1f84d25d5a116c7909dce97/jasuginabulojulilogakexis.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737278d9713---79368688278.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ccff69e83---biluxegepemakara.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/zagusuleragi.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/wiwunoli.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/479dfd0085995600870d9ca6e2e3ba99/27214418744.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/a553e5edb24073524bb74a51b75dd78f/gozuk.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f487085c51---73923017720.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608a176039b88---88025911615.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/iu0b6327tmsbkiqfj1g6plvq60/jowesuju.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/dj3ioa8r2ulushko0tcpirsst5/46457874331.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/zozesu.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/bifelefawujapavezami.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/12608097565.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/8olvntpqjcshg0am9ocbon3n28/xedojibureziselowuzadus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=resistance+training+for+muscular+strength+and+endurancePDF 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_off0001c8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8D6 11068 bytes
SHA-256: 921e3128b41e5dae2b38049b0d8bc11cb6326794df9f73154b3bbebcfdbf7b3d
font_01_sfnt_off0001e23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E23D 18396 bytes
SHA-256: c42c10c4d05cc0bccfb065a8450b60ce459c390358dd45744fd308c61d731787
font_02_sfnt_off000212b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x212B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1