Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b2b2168a237069…

MALICIOUS

PDF

84.3 KB Created: 2021-09-14 21:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a8443713a0f83b799451114ff180496a SHA-1: f5c62ad96d66c180f3058e6978bef7b94c0fbbc8 SHA-256: f9b2b2168a237069ac60f711cbf6a7ff93630af97fc04ba851f5f4f5b9c14dbe
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external URIs and link farms hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The document body is unreadable, but the presence of numerous links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=free+pokies+app+for+android PDF link annotation
    • https://egyiksem.hu/uploads/file/81236383168.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/24042890126.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1a42ec0d3f6eebf5a3a24c05c17d1ccd/ximavuwamabumogobupem.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/86db95bf6ee17a21000b597445452372/97285730104.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/sanovodarabi.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/79322182743.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/5642710474.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/tudofa.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/26767874949.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/9178678401.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/crn9rg8tqcqq1a2v6r0a0ao61l/vitaxadojojutupusemaf.pdfIn PDF document text
    • http://autovoda.ru/upload/files/48482022766.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/jeweselekeweju.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/nabugifamuguf.pdfIn PDF document text
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/75505940015.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/52ef02b8d61d174dd297e7de5d323427/97243806495.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/finebugilabi.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/38493033.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/32657060854.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321d4c24e4b---62930062884.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/vosof.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/bejudikojena.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/71288631805.pdfIn PDF document text
    • https://sainaudit.mn/File/79938364544.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_off0000e58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58E 10416 bytes
SHA-256: f4d009b549a5aab6a3b1806604195231fccf7b534768d51e3b6244f1b7a8dd21
font_01_sfnt_off0000fd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11550 18056 bytes
SHA-256: 010ab80c89b9d2f81fb225132c79c52ac118ba9b4ffcc9fa460822b1dbca5173

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