Malicious PDF — malware analysis report

Static analysis result for SHA-256 529e59862f0b702d…

MALICIOUS

PDF

70.6 KB Created: 2021-09-24 22:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3d10d160bcfb186cb9b72a2b5830162d SHA-1: 06761a14885beb7db86345cf79c3c3a4ea956dbf SHA-256: 529e59862f0b702d3db7f79e4cd7a62f1dea51af1ee74e8c2664ce48a25eb273
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are hosted on compromised CMS upload storage. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://textosolutionslinguistiques.com/upload/editor/file/34405247699.pdf In PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/timer.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210918021043_mb4r8c.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/niwazoforafami.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/9085714026.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/jubawovojefulisosemuj.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/96548280968.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/47793413598.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/88004937871.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/xafalomawamefovosa.pdfIn PDF document text
    • https://simbotour.ro/ckfinder/userfiles/files/xefukewuxegadezewefite.pdfIn PDF document text
    • https://electroagro.es/pub/files/megajodevum.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/xitibew.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce51a23909---rosiv.pdfIn PDF document text
    • https://melz-feu.ru/upload/titemapew.pdfIn PDF document text
    • http://yuha.be/_files/file/2605921328.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/1919978fd7f522c82cd0fb6dfcf435e6/19625693226.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/nonijuvi.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/lises.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613de2be40156---bafasefipirus.pdfIn PDF document text
    • http://mp-journal.com/media/file/sidapifok.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///taribitamenewos.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/91947274673.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/36166062195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=full+hd+movies+onlinePDF 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_off0000b432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB432 10296 bytes
SHA-256: 14abdf9a662d060f23046d40882277bb15d10959e01d827860d47f28a932c658
font_01_sfnt_off0000cb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1E 16424 bytes
SHA-256: 9a838afad89a203091489e9322af93e22bee1868d33c32deded8b5e26968a804
font_02_sfnt_off0000f4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1