Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0c25153527495c…

MALICIOUS

PDF

94.7 KB Created: 2021-07-01 10:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1fd9af526e1c9e73abebcf254c192492 SHA-1: 7d4dedb0e672bd81a9c7535a3d08faa456347f4c SHA-256: 9d0c25153527495cff5c63cdb5c2678aa07f5cd718eca494a23785e6418bd233
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to direct users to malicious content or phishing sites. The embedded JavaScript, though not fully detailed, is a common method for initiating malicious actions within PDFs. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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.
  • 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://coretry.ru/uplcv?utm_term=snoop+dogg+and+will+smith
    • http://omonetach.pl/foto/ilustracje/file/viguboluvarazogatixoji.pdf
    • http://sk-massimo.com/js/upload/files/33822713235.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ff3c3e726---zerukinanubirego.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/phovohgau1590o8ne197harkgg/5612745373.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759de50379a---54280156799.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16094c95936ee1---rotesupazazipiketisifovoz.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/85f78e7358212180d22148ff1733a892/45864342527.pdf
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/mubinolevetekoxefarusad.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf06da2c04---lezemutazoludegewa.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/v30derp093bgrujd6e5t8l4l24/temune.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab67cdb080b---36284683935.pdf
    • https://aviatroglo.fr/IMG/file/rozebojalowevofalu.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608374735984a---wiximin.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b448bb7d8c4---nedofafemefam.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3a3ac57d5---gidofujaruzi.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160704e08b4315---jometowotagonirimoside.pdf
    • http://thaiboxes.com/piceditor/file/bedofatujemulatebiga.pdf
    • https://speakingparrot.com/upload/ckfinder/files/77004965346.pdf
    • http://driver-jazda.pl/upload/file/9886789137.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cddea7a25---jotokugosisimaromixuj.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/e06cd2d0f7ce11887d21dc0a991a6607/38227146066.pdf
    • http://heureka-cz.eu/files/vubimudixavotipufugem.pdf
    • http://davidhammerstein.org/userfiles/file/4326099132.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7fe.bin
f0a2e8089734bf5fded737927f45bf334b690c6655badc05ba5f07b39b00be45
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FE 10768 bytes
font_01_sfnt_off0001105c.bin
88ad34f8ecb10c9e63fc6536c0c7c6639273b37d9759e1d77ba6c925f78f8ad1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1105C 17956 bytes
font_02_sfnt_off00013f57.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F57 16164 bytes
font_03_sfnt_off000154cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x154CD 16792 bytes