Malicious PDF — malware analysis report

Static analysis result for SHA-256 209829477deaeafe…

MALICIOUS

PDF

88.4 KB Created: 2021-07-12 22:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3745aa48cc9bebcac51a79608ffdcc40 SHA-1: 5ad27f71983b45fe7f928cd8c7a6f4e3a864a0eb SHA-256: 209829477deaeafea95b8008dfc1afd66c492c60cb88c666dfacb214db775547
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated, preventing a detailed analysis of its specific lure, but the presence of numerous links to potentially malicious content is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffd28c680a---fezikupatemopedowogebu.pdf In PDF document text
    • http://bora.su/ckfinder/userfiles/files/68598096846.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f8b21bf2d7b3e03a8341168a57982610/wujuriguvewudofu.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/27718971133.pdfIn PDF document text
    • http://tao123.me/pro_pic/files/75220789737.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/bezofulitokunafixemikilaz.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608304a235156---35664292038.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/giriberinikuxusopinojek.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/655mi44nj2snuv8k24upncuila/pekugi.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c86e97a832---tezewefizekozemiwidi.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/4kcumupnkagf7jsj88vb2emjk2/xelajuvijosufidepofe.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f035d7c76---73472790888.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/f59893a9755a301e601a3b3dc8a1b4a0/xujisexijubidexusirilu.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add4cf7a5e6---vaxatunativifod.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/74810655742.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2e98c6dfb---34985671902.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d357d3b3a---69334587065.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/39702643575.pdfIn PDF document text
    • http://sdds.be/userfiles/file/nanemepezivuletasadi.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa84d61934---95224529743.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/cd2e553a93f983f056573f06523ca19e/4617448586.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/128b75990d5f7f56e51e11335e653453/sokuf.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8dc2edb31---jikabiwokosawapug.pdfIn PDF document text
    • http://usmleworkout.com/files/file/81582805888.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/vidazexixanijese.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/64f37fe0cb479e4135286f5997b2262a/19124137972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=reading+book+dayPDF 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_off0000f8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C5 16972 bytes
SHA-256: ee1bd1739f05af19d275e7dbb3ebe371b4de2bafc638eb25668783dd5c7da591
font_01_sfnt_off000124dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF3 10400 bytes
SHA-256: e15d12fb9f699690670eb2f19e0146f25f6a2e0d43472181c5121dad03c1b70e