Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f99a8787463f05…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 13:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a8229061c1c8587a98b16114876b0c8d SHA-1: 355a2709e2a101cb572e00878181d243b454aa73 SHA-256: c1f99a8787463f0588feee9b6afee21c89e3bedd7ce9f8c38bdbf1a7e646d3f1
176 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs hosted on potentially disposable domains, a common tactic for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates this pattern. While no scripts were extracted, the structure and URL patterns strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://sahamit.net/userfiles/file/33517488033.pdf In PDF document text
    • http://ateliergermain.club/sites/default/files/file/40658686364.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c12d5c6bcb---10825169385.pdfIn PDF document text
    • http://ccshecea.org/upload/files/14501150698.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613796b02b1ac---50658396687.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/munetarevufawibelejaweri.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/zafalu.pdfIn PDF document text
    • http://runhouchem.com/upload/files/21482661528.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd27bd4c94---jowudemileroburowupopus.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/63312017064.pdfIn PDF document text
    • http://northcity.rs/slike/files/91957970892.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea34971f14---65940193628.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/refowamewufo.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/78968732337.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/00388d5c100c88fedc3aef199ac3a1c7/gamejojazagiluwofek.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/32457226932.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/wunodukokedijikafisimef.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/46128190231.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/mepamuvitapeve.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366a250c451---35466223097.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/51275814297.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138006d3ea4f---7983579005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=control+android+device+from+pcPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/67427021594.pdfIn PDF document text
    • 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_off0000d80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80B 18264 bytes
SHA-256: 294ea3c8d7b266724a5475664af93aa84583d8878351958aeee7b8230a6fe8b8
font_01_sfnt_off00010725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10725 10708 bytes
SHA-256: f7243a9c9e21925920d145d29f526d8529cc00b3d0b1cde279949c29cf3a0008
font_02_sfnt_off00011fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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