Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f896f023a63011…

MALICIOUS

PDF

88.6 KB Created: 2021-08-06 16:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17a7babda20dac4a6577d7f0c35d5f56 SHA-1: ce88948709593b6a0d98eac4b44fb170445cb95b SHA-256: 28f896f023a6301197f42617f254ac721996e399a66e40db364b69cd8fa348af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, potentially for phishing or malware distribution.

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://queure.ru/uplcv?utm_term=how+to+connect+my+bose+bluetooth+headphones+to+my+macbook+pro
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/91e9642f0770373f6871b30ffb1742e8/gaxexesosesog.pdf
    • http://jcon-aps.dk/userfiles/file/14210093178.pdf
    • http://artstudiodesign.it/userfiles/files/xasem.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1038f05133---ruvep.pdf
    • http://archinfo.ru/uploads/file/risifiva.pdf
    • http://hasyo.net/files/file/morubexolinizurutigibuke.pdf
    • http://penzionriverside.cz/files/file/82064024071.pdf
    • http://i-daa-wl.de/userfiles/77040627494.pdf
    • https://kaktutzhit.by/uploads/files/18541819651.pdf
    • https://roomart.uz/ckfinder/userfiles/files/93420220861.pdf
    • http://worldtile.net/jangheung/userfiles/file/dafokoxagozi.pdf
    • https://la-klamm.org/userfiles/file/sivekokaxususogokevowoso.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607151927b662---31457969504.pdf
    • http://innovatepc.com/userfiles/file/5761233548.pdf
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/demarasitefamixolikosip.pdf
    • https://ddshower.com/ckfinder/userfiles/files/sojowa.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/k00494vfr7tlshg19u2u3pa615/zubodoxibosijopawo.pdf
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/63765875295.pdf
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/vofewukisiw.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/r0q2r549tsqai6mm2bocfc14nj/72903642559.pdf
    • http://kingalbertltd.com/uploadedfiles/file/52416734874.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/31e46d0eaa38bab6a243fe72d91c0598/lizemox.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/n4b3ceiocc2dvoibnjc8n2l65g/fexeturiwuvonajokipava.pdf
    • http://ingfrimale.com/userfiles/files/jaduzas.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/gim26rc503ta3e14a9qlntc1l1/furuvifidures.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5bc.bin
cd9af15daadb7be02f12bf0b57ec66b98270e4da822f1a2c450fa39da1c33add
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BC 11208 bytes
font_01_sfnt_off00010fa2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA2 16792 bytes
font_02_sfnt_off000127b4.bin
70d211cb587e14290da517b11504199dbbab27ca33952ad7722c291052d2fc7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x127B4 17004 bytes