Malicious PDF — malware analysis report

Static analysis result for SHA-256 e697972f8b7328a8…

MALICIOUS

PDF

83.7 KB Created: 2021-07-02 07:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56f5994636c7ece6f404fc7400a53600 SHA-1: 90e86d995c66e64245ebb97a8302a46b5c663a59 SHA-256: e697972f8b7328a85681680d498b6546998798cdb9288daa073de6a6df7cdd89
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The file's structure as a link farm suggests it's designed to lure users to potentially harmful content hosted on these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608185a35432b---37338584067.pdf
    • http://headlinesdinerla.com/uploads/files/vetibijanonokiwiwi.pdf
    • https://gloriouz.in/ckfinder/userfiles/files/duvokijokiwisokadosurib.pdf
    • https://tavio.ru/files/file/13579512318.pdf
    • http://skrabl.pl/www/rpbd/fck/file/kudawikonovamatutefi.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/8c0ef029b0c4231e0e2f9b848c1ecf2a/renoguko.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814e3ece604---70736165140.pdf
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/rewemojelomovejedulu.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/93o9p6ejtrsl5uajio1m5gu6s7/gotejopejefajepatigugugo.pdf
    • http://www.findvoters.com/userfiles/file/lazawemefewajoribefuxikaz.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/539dba23c906ba1e89149db87982f6c8/29917930935.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/f347d78a710b1451907c3f8fd3c2470b/95355943281.pdf
    • http://mwclass197050threunion.com/clients/0/04/04fd426b2d2cb16e649a8dfb8bed347f/File/38732821697.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abc092633f1---85346292627.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e53e2439a---lipapusof.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/ba46a1c643575b5935e4769e3cb4dd23/mewatetamajiwa.pdf
    • http://kppzp.pl/userfiles/file/13682524637.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0578ea02e---xifap.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084caf6db6b9---12471171204.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/4485f3e7ea33eba782259d3556388e29/wewagafe.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/baae8e822936380cd068e21e582c4dcd/1533855496.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843750679bc---puforirix.pdf
    • https://musikkursus.dk/userfiles/file/fufepabanogefabusuzaziveg.pdf
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/53juvtbbpi8q2mrod9no91lp7t/wojimubekexalukiwelo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=518+divided+by+7
    • 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_off0000e3a2.bin
799738d33009be97f86a084e631b72f5af75ef673b9b23f0bd73992803a342f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A2 17896 bytes
font_01_sfnt_off00011310.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11310 16792 bytes
font_02_sfnt_off00012b27.bin
84c1f1666bec4bdab1cf5a213d223c50bd8e12bdd4d17f15237bec9b977dbbaf
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B27 10112 bytes