Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e71c2fc8e8cbe15…

MALICIOUS

PDF

107.0 KB Created: 2021-08-06 14:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 243187039521e871831c539b63d87557 SHA-1: 44f41b59a64db7f5e048473dda47dd2eb37f4be0 SHA-256: 4e71c2fc8e8cbe153826f629afe7c4eec66b8a99edbe05ab1aef809b143beacb
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and multiple external URIs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit vulnerabilities or trick users into downloading further payloads. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/87c7fc24f5f77ea77984cdc2531fc409/xinidagusilusi.pdf In PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fe4a55c40---54056780538.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/58982425484.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d147e12ef---89506231956.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/6581g8h9e09grc6kgk52fmdado/lenanidak.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/4gbj9i28t775bc57o9c6vg307o/fuwelekusiranitivujikuwag.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/72625480528.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/41814441454.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/6fmd793q68g8sf4qpvduuehc1v/44528855275.pdfIn PDF document text
    • https://actor-conseil.com/files/file/47136065811.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/70397328757.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/10990972087.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775d9e696a7---18373610820.pdfIn PDF document text
    • http://fpole.ru/sadm_files/59781410044.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/0d19b1234dfb0a55c730579230d3968e/kositebepabulavotewobonir.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/f2a903f1f62b5d819e2f3ff08c716442/20725296514.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/284c2375af6e3031898ec45e198ca9f6/wazapekefo.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/96247877737.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/27530072842.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/xafamenimej.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/sibetufu.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/gomevewerev.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7f85bcbfb---lowuvufujoloxipiwudux.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/96797152297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=descargar+musica+de+los+tigres+del+norte+pedro+y+pabloPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001203c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203C 16228 bytes
SHA-256: 11c5a07d087146020572b41e3c25cf6f3fd7b709257038c787216a38c3b0495f
font_01_sfnt_off0001361f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361F 21272 bytes
SHA-256: b467081914db57cecee68491ea8df61d9f520ddb0be91e857064c4cf747f91d5
font_02_sfnt_off00016b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B82 11212 bytes
SHA-256: 9c5496d1b04e9737effd962ecd156387f0edbd4d0a471abd31dab4e7163b0412
font_03_sfnt_off0001855e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1855E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1