Malicious PDF — malware analysis report

Static analysis result for SHA-256 abcfc7f679b7610c…

MALICIOUS

PDF

83.5 KB Created: 2021-09-14 09:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65c3fe26e13e6ab112d3d3d46663737e SHA-1: eb9f741b80566f8a9a6e010c8c01097f5a5eafe8 SHA-256: abcfc7f679b7610cd762812d5d47fc9352f5b92ec867bf3b8d346b270919c575
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=sixaxis+pair+tool+for+android
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/65539983057.pdf
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1631011596/files/75581425994.pdf
    • https://flammerouge.ch/userfiles/files/satejav.pdf
    • http://ljjxmining.com/uploadfile/file///2021090801535752.pdf
    • http://refpecsbelvaros.hu/kepek/files/45675819495.pdf
    • http://nissanotogovap.com/uploads/images/files/63846984010.pdf
    • http://absolutelyneon.com/userfiles/file/48207077976.pdf
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/88613565390.pdf
    • https://podiummagazinenews.com/ckfinder/userfiles/files/16283099130.pdf
    • https://duvanco.be/docs/files/zijibofenazoxixesojelufu.pdf
    • http://vinacafe-dalat.com/Images_upload/files/bugemiwabefa.pdf
    • http://hc6999.com/userfiles/files/wanizimibunasim.pdf
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/saxegaj.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161370f9737447---togedozijoxatizazanivapu.pdf
    • http://dydlhx.com/upfiles/file///mumonalefepazisibo.pdf
    • http://www.gabrielamaciel.net/images/content/file/65754121038.pdf
    • https://pasarangroup1.com/contents/files/wajap.pdf
    • http://ville-dammarie.com/ckfinder/userfiles/files/fitawuvurefevesed.pdf
    • http://artospace.com/pics/file/jogak.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/69b9281a6f2acc82d784ab0a14ddcf79/83237133917.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613408d19b794---99172154790.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/vjefjbf0porlisnm79fc2j85k7/4486570032.pdf
    • http://kennycojewelry.com/userfiles/files/202109/1630495316.pdf
    • http://ecole.ru/text/images/file/5935451499.pdf
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/polutu.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_off0000dc60.bin
277b7f342fcad08df06fc4004dec2a579bc150a0bb512ca7ed0255b6d1f1e7d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC60 19768 bytes
font_01_sfnt_off00011033.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11033 16792 bytes
font_02_sfnt_off0001284a.bin
55ac4d6c3885ee01fbd1a136c9ed4fa86a4f25473007a334ccd8dfc8b532cb30
pdf-font-stream PDF embedded font (sfnt) at offset 0x1284A 10536 bytes