Malicious PDF — malware analysis report

Static analysis result for SHA-256 646fc128c901db86…

MALICIOUS

PDF

78.4 KB Created: 2021-09-03 09:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 20db848bfeef7652b86253f60741e701 SHA-1: 126b1868f10b457b529c5c4536f51568c1e216d9 SHA-256: 646fc128c901db864ca21aae9a5d77b189a8871a609b9de2275fc09df9b55463
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm or phishing infrastructure. The PDF's structure and embedded links indicate an attempt to redirect users to potentially harmful external sites, likely for malicious purposes such as credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607384a277e4e---tokivepevu.pdf In PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e93b5bb67---tosederodupaboxurolowuxa.pdfIn PDF document text
    • https://marosme.ro/hirek/file/65905448791.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/56337644117.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/69307854865.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/sifuzovogawimumij.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/vqet8dfhehuoo3rukt94hk8m9j/getigesuwatemimi.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/3k0hj1qpmu5qdhcmsr56oh46b9/92946516817.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/15f459ea9593140b83305b6dc57bfbe0/55171684464.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e511887596---renukab.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/79366065699.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/j7jpcq48rsns8gnsa7eus9drmt/34569905136.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/navabitimomedadiwoxazef.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/nuzowedaser.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/6a259b41acab04b470e1fbc1a2e3ce4b/fijanara.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/kodurupek.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4801dc90ba---1441411859.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/powekisalojuxironifisi.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae81f22cf4---suworu.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/85115590705.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/pegedifegami.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/39887262305.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e1943d447dc---47346845721.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/91965595395.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/00sgttqtjgn0el567225546pna/40853852046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ecology+unit+review+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_off0000cd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD09 10788 bytes
SHA-256: fd84040b26368b9325527a63a2b7f34dd1d23a6dc30730f537e55aa344a88271
font_01_sfnt_off0000e5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE04 17672 bytes
SHA-256: 1622f46960f4c16da9586d02b572480b9a8923547ddb4ff24455980b17147182