Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b016945058dcd3…

MALICIOUS

PDF

86.4 KB Created: 2021-06-25 15:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 345439de1769e907f90a5589594395e1 SHA-1: 53185035c13be286eb76379c8a6e2417e9df9158 SHA-256: 91b016945058dcd38c7b2af211f0a86bde67465bec23ea8252b63efbe8b9296e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://cructi.ru/uplcv?utm_term=pork+chops+with+cabbage
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/657194c1dc8414be388a2a92914bf508/nogewezabanedevewozo.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/rokiriz.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/170243a8ddd3f84a437c1c811f70242c/nisazedasarekakenepixa.pdf
    • http://highendschmiede.de/highendfiles/file/45279885156.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c24b4251196---22718677214.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8ebd802e0---73538161388.pdf
    • http://islandpointfl.com/userimages/rovanunebuwetomugevamuxip.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/747bfc22e08c4c29f763034030f788ec/xiriv.pdf
    • http://malbreil.com/userfiles/file/bosuvuzore.pdf
    • https://koratspring.com/upload/file/jinitebarokeziw.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/47d05f03226b3bd66cfa621f174b8c30/90297555778.pdf
    • http://allnatureint.com/userfiles/file/33767877494.pdf
    • http://ipublicity.cz/data/file/37383268562.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3fa10baf1516433f250c162a3a4ec952/97829310027.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/5a4e140e93f91e7806f127bd0d9c219d/32949792393.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886d983b6a2---nabajadeparej.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/lscefc6burqe8519fpg1df06fm/96351649669.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/248db5635ca78660a04ac20e6c9dc4d9/pokapufabu.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s8titjufq01asp67bcb8ke8j56/xokuvuwiguwa.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160852318badd8---bozepukofijo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 16792 bytes
font_01_sfnt_off00010650.bin
8bf46aea2d497a4a4e865e336dea3d1c287056b36088bee718414923c8513243
pdf-font-stream PDF embedded font (sfnt) at offset 0x10650 17552 bytes
font_02_sfnt_off000133cc.bin
9761ab4c2891b5327cb05be99fab313beb215740ddf6ee372c4d2b8f839bce6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x133CC 10820 bytes