Malicious PDF — malware analysis report

Static analysis result for SHA-256 a582a1aa9d08d4b8…

MALICIOUS

PDF

90.7 KB Created: 2021-06-15 21:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1be2cfcdfc9a5cb01aa7229469272177 SHA-1: 9ac2b844bb1abd92592802f551f121fb289191b4 SHA-256: a582a1aa9d08d4b8c0928f4ceb972d23e70e9205e3d23e6cbe0babd817acefb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the presence of many external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crewmak.ru/uplcv?utm_term=fire+pro+wrestling+world+download+wrestlers+ps4
    • http://amadpich.com/userfiles/file/74933688715.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/f1e4079b9cb4ee3ea92049e23c91f516/novivaseninofegup.pdf
    • http://greenbrier101.com/userimages/98267277137.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b64cdf5c3---74707553771.pdf
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/24647548221.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02bd89237---94674976595.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/9aee786903a96fc355d553985a3d0cf6/37393363591.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/ludelefedub.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/f3t9p3fpvq75i5kpcf4jldgoog/malaxemojem.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/2423d04e20b8fcc52e408697c566dfd4/22948636905.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e054b8564b7e93d79d6eed83c007ffb7/tubaniretiraki.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/f9sjsge0fvkndg2ks0or0dd3si/60803849481.pdf
    • http://kfbi.ru/content/file/nasowipegefef.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a55ebe35f---32913940634.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/66t6509tgjhvff6etvk31h9u2d/mufoxavojuzaxegoribuju.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/8c61baa150144fa85ba596ba44628535/momadivajovosarajutogal.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/tjnafblalbi57gvpr816o3r4en/51677442499.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/hjqkdgt9v5ratfk6shma187oq5/2147194806.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010242.bin
d64ccba69f5d022a27eeec370ff11ec9d0bcf0a781d814eca05b9d96258b5cbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10242 3076 bytes
font_01_sfnt_off00010d40.bin
d6a0c7c706eb8446c9807f346bc7dae0ee61a18b91f18710b8c5d97fa7253fdc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D40 5260 bytes
font_02_sfnt_off00011f4f.bin
6a22933993c661f8732ae2f012596dbff9d0eafcfb969685ba4c4a9f7e8bafd2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4F 11744 bytes
font_03_sfnt_off00014790.bin
a45780ac238e22d06015fbb297150eb8d9904628c36cf561a56998aa1b1d8c93
pdf-font-stream PDF embedded font (sfnt) at offset 0x14790 16136 bytes