Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84a340a31e36435…

MALICIOUS

PDF

79.9 KB Created: 2021-09-21 01:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 701300407aeec735843d9cee617b27da SHA-1: 6460e308820ca0df6124dd0c09ef7716463b86b1 SHA-256: f84a340a31e3643500b49b65f0d8c0f9e85dceea21f450b79be0a2fb00fc4fc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/68075c5fd3a9b3f1b7f26a845dff2ee9/wizejebexixe.pdf In PDF document text
    • http://hnc2.com/userfiles/file/90082532074.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/45126698083.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/24788019750.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc1df53df2---6238575594.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/zefetexezokapewudip.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444b5886e6c---59631219823.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/mojorodezotixowes.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/65124047328.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/23945358384.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/54144586405.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/6757798064.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/dutowiga.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d63b791a3b---jupobelipukexel.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/51062260965.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/66562607232.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/wawirozedewemolofagij.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/92403852892.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/dezuvagisi.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/jivaruno.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/fesuruvujazuwuxemapesaxag.pdfIn PDF document text
    • https://thomsonindia.com/userfiles/files/tivukebiwitorefinilafol.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/mapiwiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=free+download+ldplayer+offline+installerPDF 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_off0000d3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EB 10668 bytes
SHA-256: b6e41bc39eb55d99746841491b95123edbe6405980876278c8174300e6926d7c
font_01_sfnt_off0000ec85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 17444 bytes
SHA-256: 3390864c5b3d844de984a8dd92993ae69298779dbb59216893d98508186d684c
font_02_sfnt_off00011a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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