Malicious PDF — malware analysis report

Static analysis result for SHA-256 11909d9f21b660a3…

MALICIOUS

PDF

88.6 KB Created: 2021-06-27 11:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 491829b794871a1028c3d4b4d3413bd3 SHA-1: 01ebb4809888ac3fe47b6b3d6bc079fd9be5b577 SHA-256: 11909d9f21b660a384ad0d67c6f19008356b49c361da8e6145893e173c7e8bcc
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites and disposable domains. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is a link farm. No scripts were extracted, but the primary function appears to be directing users to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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 http://x04ydivan.ru/userfiles/file/xadok.pdf In PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/n1lt6upcebpekjm4mt7i9qiui7/zigakoxiruze.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/26146811609.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b4a1f175e---zepilegadadetufekatimirov.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a8931bca901---gulebisewunanomadotadag.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/68182289140.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b5669b097---30796050855.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/2f2b999b1283f1ab91de6a7791b6aa17/nirov.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3a6128fc0---73090405980.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/3mer513pvr80c84nug411379u5/wobasupovixafoje.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160847a6b68a21---82881261594.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/812d8dcee31beba8ec067b3e42ffef55/rozomujezusekapu.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/17bisiv5ovgp3n6ueacbtlq87n/dutufujivevovuwexuwe.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff370e9847---87277845047.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/zigadasewunu.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5d48a2517---wabudizodejidasokon.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836642d785f---fisemuvi.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16083bfd40e734---11346673033.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/sobisim.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ca236445b---xokonopowunekusadapomipo.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/msmirp32teghn5ilccihqorfe2/94353797191.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/767d35179f2b1e8efb1bada66bc6d652/25121742175.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/5cae5c4065ca51df506363352812ae10/jobafibatigiworok.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/5f95fa7af480ac2a0811affb13734ba5/89194748541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+buy+the+ramp+car+in+gta+5PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 18928 bytes
SHA-256: 117480aa9cd953cb8de5582a20fcc08120018627a4d2cc8e02a2078eb8a027e4
font_01_sfnt_off00012335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12335 11172 bytes
SHA-256: 8207ddc408ecbba0a9730e9d6e4a99c47b0062e34a7ab547a8833fdfe556b462
font_02_sfnt_off00013d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1