Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9922b7ed063b4ef…

MALICIOUS

PDF

84.5 KB Created: 2021-09-22 19:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 35113f6da6e46bfad2280fa4c1418aaf SHA-1: 48d1872450f3ccb2393e4b03b8c8c08660391e5b SHA-256: f9922b7ed063b4efeecd96143c277b4a7398927cf7791901f46fd313bc4c5175
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to lead users to malicious content. ClamAV and ML classifiers strongly indicate this PDF is malicious, likely a phishing or malware distribution lure. No scripts were extracted, but the extensive use of external URLs is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=compound+bar+graph+definition PDF link annotation
    • http://vizugy.hu/uploads/files/64604096545.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fukewoxuwesupaluzawanog.pdfIn PDF document text
    • https://signika.pl/Upload/file/30673794627.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/67ead2773e250eece0b7bf1b480f1954/mejomejalimofarekimoseji.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/tenovaxadimib.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/04dd6ad910814eec00ac300480eed0ba/51429395695.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/23641344232.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/gotabivugokurozafuvuw.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/39570200967.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/katuwimuwanarorira.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/64785215115.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/litaval.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/xalituferata.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/53638245935.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/xomopajeturumaruxazu.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3dd069689---24473780876.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1614905717e0f4---59364072791.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/27482593401.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/gagonesumekej.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138670304e19---kuxito.pdfIn PDF document text
    • https://red-adlay.com/upload/files/72517856351.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/subuxo.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/f211b7e80df0e39ad1863fb93ae1c16b/96502700247.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_off0000e5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A6 11004 bytes
SHA-256: 62c25a31fb9880a33d55f9c67b709e9c725d28e81d278ad8f6028be3b7ac1755
font_01_sfnt_off0000fe8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8D 17892 bytes
SHA-256: 07ce6d9d2ab2904974074e551b9e91036704d4195fe93ffece1eb22213cff8a5
font_02_sfnt_off00012cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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