Malicious PDF — malware analysis report

Static analysis result for SHA-256 2155c3840ea264e2…

MALICIOUS

PDF

74.6 KB Created: 2021-09-10 14:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1851e53b63858c468a420549bd303c9b SHA-1: c877bada678d393457536e45d3a786dbb7c8fcca SHA-256: 2155c3840ea264e2e944d8e54e77f0a1fdc0a6ba73689696a8ee9f25703c343e
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to infer a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=how+to+change+email+name+on+android
    • http://xhiehchin.com/Xhieh_News/_file/jekatefetibitobidutiga.pdf
    • http://inter-travel.hu/_user/file/52155137217.pdf
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/89503247531.pdf
    • http://kukdae.com/files/fckeditor/file/voxemubixofis.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133b14885db1---fotezojepuvuv.pdf
    • http://multiflex.ru/userfiles/file/18459615163.pdf
    • http://uniquehotelsolutions.com/files/others/xeruwivelerivesaxi.pdf
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/zakijirajovu.pdf
    • https://kaptenhoki.org/contents/files/firaxuranegesikoxes.pdf
    • http://staceyasp.com/UserFiles/file/92381958817.pdf
    • http://cerezolorente.com/files/cerezolorente/_repo/file/75722277034.pdf
    • http://samnakthodrahassob.com/userfiles/file/74781625445.pdf
    • http://www.tiande-global.com/ckfinder/userfiles/files/warosedobap.pdf
    • http://bioident.pl/photos_fck/file/nijezimikisufode.pdf
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/tewugixadozudipo.pdf
    • http://jingluo.net/uploadfiles/files/74312106437.pdf
    • https://swaarm.de/app/webroot/upload/files/34280300710.pdf
    • https://www.agencesramos.com/ckfinder/userfiles/files/vogomotenag.pdf
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/74596641699.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613112fc0b2c8---nefukiwa.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b4699832a---lujezabatozesa.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_off0000c029.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC029 16792 bytes
font_01_sfnt_off0000d83b.bin
762a52e0f3dbb6f6e70abe5b51ae292486f1f094d1d8cd7e2cd4404260630a8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD83B 17488 bytes
font_02_sfnt_off00010524.bin
346f8326f50306e4b14e5d196398ef7b464e549e8d0188547738ea176b3240c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10524 10724 bytes

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