Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd6f1fe5c66e9bd…

MALICIOUS

PDF

86.1 KB Created: 2021-06-26 03:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56b9e2666bec3dad2e49b249233e4cf8 SHA-1: fba58fc0a0215e9577d00dfe27b93de1e521cec0 SHA-256: cfd6f1fe5c66e9bd3999ee56d1037c7489faaa086e52132fd6f70e3a6d177264
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://nepalimodelagency.com/userfiles/file/3794403900.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/58ed9d1af197c4e83bf8d8ba2db7d0cb/bofab.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608da363dbc2e---diwusupezut.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/87aa8a5704fa68032ea07ecae99469c7/63143503258.pdf
    • http://splogservice.ru/content/file/lumetirovujozuf.pdf
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/1fde79c09623c4f90f8c570beff7f133/53859536134.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/mgjolpr3ma75pq51pseb106b86/vogilu.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/b8b77c688447e13a542f0855c2fe94b4/zexubutonemitozerifatep.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/au86cv9l0lbvesvf9j5nqeoq15/63392091240.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/000b9c9bb5919e2e59089f4deb4e9063/48729462345.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c6009bea1---vasukifovovemibej.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609736eb71249---ganofojovanadev.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/b14936ffe20fc431e7c3e7b3b745a996/xubemufajuviwewakunimeba.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/19653c943babfeea9f4a81fbcfb8594b/88298560944.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086d334edef7---90187329909.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/54df346abad2ae82aac360cbe5a2f010/43259833872.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607626202b684---simazapifupitosulakiw.pdf
    • http://www.alfapilates.pl/upload/file/77918948124.pdf
    • http://solarexperten.ch/fckeditor/editor/images/file/29233114203.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6abd8837cc---jurexumoxazeke.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbe3a483c4---18494270391.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=maple+old+fashioned
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/9e0d5b9d3068fede24627db94c042a47/87358157021.pdf
    • 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_off0000ec5f.bin
5dcd79dbf66ad5e688cb50d6582901cc45baf2f5a321c1276cc4245365547804
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 18356 bytes
font_01_sfnt_off00011c1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1A 16792 bytes
font_02_sfnt_off00013431.bin
cd8ad574c75155a21bef17f2072a5292f5ad82f0c5821bdf96a26f219ded0e1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13431 10392 bytes