Malicious PDF — malware analysis report

Static analysis result for SHA-256 c969fe042d8ba6a2…

MALICIOUS

PDF

79.8 KB Created: 2021-09-11 15:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 36852682bd3ce52e50df90004a192e91 SHA-1: a92d7211856695ebf8891bca0e70da055bced1d2 SHA-256: c969fe042d8ba6a27ff8e2b13df79003e51abaa9d733ee738d403f8206d4405c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://okna-kursk.ru/page_edit/_samples/userfiles/files/35929806196.pdf In PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/digeposojaxajidolo.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136dc93742a2---12580625517.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/94772309129.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/dofutobanazatodozim.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/46290372346.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/70524426973.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/84440571832.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/e6031adf3adbf233448507afe37eb75d/ripoxupizune.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/digodewelarefofakofa.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/winakorupalud.pdfIn PDF document text
    • http://c-amc.com/upload/files/54357843137.pdfIn PDF document text
    • http://asustainable.com/global/file/bagobi.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109011838437486.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/19952911488.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/kuxivonemin.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/36553560496.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/gubukoguwefomefunosus.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/magetokedoloj.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/masawenukodezo.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/medugasipu.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/c5568bfd4c368481a881e7c073ec9934/galuziziwere.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/mulavanu.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16131851894d3f---faramobadegasajuziz.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/lapubinosafiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=tirar+print+em+androidPDF 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_off0000d4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B6 17484 bytes
SHA-256: bb56e3b960d23bc30374a180d2e8db3ddb4f9b6137c504c0f30a5e1f0a09705b
font_01_sfnt_off00010212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10212 10300 bytes
SHA-256: d3ba4f7bbf4de5193b555f225a8d3fa4f18cd0f953f203f3b061dcb6a9a6f4f0
font_02_sfnt_off0001193d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1