Malicious PDF — malware analysis report

Static analysis result for SHA-256 26dc7949b6830c0f…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 15:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 73d4a9e3eb680b3c1dace93930bee395 SHA-1: 4ef757e65af53546db48618b8eb299f2d7757369 SHA-256: 26dc7949b6830c0fa973deabf453362bf5e81e67055864d012e5d47a502a67b7
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to manipulate search engine results or redirect users to potentially malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/5e100b975e7971bf1a22758cc8a7f903/vabusowigubonananos.pdf In PDF document text
    • http://studiopignotti.it/userfiles/files/rivovam.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/27931710237.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1612d17235cdb4---51857709986.pdfIn PDF document text
    • http://zae.me/datafiles/file/27302609914.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/kurifumojivelagelupasaf.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/runimuvadosozofijum.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/43559431804.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/7415692328.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160738e9d73add---6011750071.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c1a64764c---51419800541.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/a3afc55b0bcfcd255d7b80dafeddc5ac/felorebuwunesati.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe1b5ec6a7---xiwawalenalejazuxalejewuz.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a961befe8be949e1998c41e43736a57/57262227186.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/2858799314.pdfIn PDF document text
    • https://belloverde.net/emailer/file/86214062651.pdfIn PDF document text
    • http://gloria-eurex.com/8070068132.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/19550354629.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/sg4v0emvv0euu0mo13fich0q84/56467336819.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/bsb3btsbuoghh42qjrspl736gs/kaxabuteliralidinut.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/miwupebe.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efdad32f057---nitakisitiwebidowakeme.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086754c9548a---jejigig.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a724eab3548---87559232581.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/51de76a16d64532722d0dbad194e9995/65127983873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=properties+of+matter+second+grade+worksheetPDF 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_off0000e1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BC 11200 bytes
SHA-256: 44bbe39d721523c9e4108f8914bd3298cd2dd75540b049bcd09092814dc64f5f
font_01_sfnt_off0000fba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 18316 bytes
SHA-256: 420e72a522fa535191facbb3e53b85d953c5b6fae030ac57ab3c88cb74a4e7d4
font_02_sfnt_off00012a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1