Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe9d5a8d951cc9ff…

MALICIOUS

PDF

86.3 KB Created: 2021-09-01 13:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ab2dcd20981d7525aa9d94de1d2b8037 SHA-1: 35e50430f76f836f43e656994546d9143ec8e1aa SHA-256: fe9d5a8d951cc9ff9fe752dbbda1874d8344fb27e46fe2c6c4be46ac9bdb9e91
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=the+life+of+the+mind+meaning PDF link annotation
    • http://leoclubmarsala.it/userfiles/files/76156139085.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/xurekewufaxobab.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3f988e05f---66202089174.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/piwewinuxe.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53069906e4---sufumorir.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/84025186617.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/wumenesenokilajefak.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/0753ef7133b5c314a5b7865562bdeef4/89977537186.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/vdc6g938123g3g84mi9nmg606d/25108829654.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088ab9daa7e3---gubuw.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ifucvjg7dg9fckvdpp68b9d02h/48660045476.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83ff4499a0---gesurufenoz.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e09abc23e6---fowujixikaraxudazisojukir.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/82743490734.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/46682982242.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/34749821391.pdfIn macro / runtime command snippet
    • http://tecsun-moscow.ru/docs/file/lisufi.pdfIn macro / runtime command snippet
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607546745ed62---30269581688.pdfIn PDF document text
    • https://newoptic.mn/uploads/files/45467833704.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070b2d838fdd---50476769511.pdfIn PDF document text
    • http://saint-party.com/media/file/47178650743.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/famiriro.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d27290c1a6558500b1ae53e7a0c1bf5b/86450029648.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/99860799845.pdfIn PDF document text
    • http://rocincorporatedIn macro / runtime command snippet
    • 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_off0000ecfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFC 17648 bytes
SHA-256: 5cf7de43f08c867e6ea98695ab3ab46d1c282e72bafa6cd148a68cc71b543c24
font_01_sfnt_off00011a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A98 10496 bytes
SHA-256: 89218897cf6ede8ab2fe7242b684eaf804451911acb016be210f0282e9bc3382
font_02_sfnt_off00013209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13209 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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