Malicious PDF — malware analysis report

Static analysis result for SHA-256 76826f1ce38f19e1…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 08:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: d51ad4acc0fb3db73c7d78e635b463fa SHA-1: 86eeba2caf20f7702e4e39fe261de4843ed84c9f SHA-256: 76826f1ce38f19e1f0e124e76f6edd3df10734f19e90d776f3bf4578128cf407
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to various domains, many of which are likely compromised or disposable hosting. The primary function appears to be redirecting users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://abw10thstreetne.com/uploads/files/jekolal.pdf In PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/mowewebevifiw.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/noxon.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/20116699759.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/2a752bb685e2682489f1c3a652282938/11357493159.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/tugodufukazaxumegamerugaf.pdfIn PDF document text
    • https://shoreluxurylimos.com/userfiles/files/tedogomi.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/64740659789.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/83682205852.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/399b8c0e5e4f61d18ea6fa8610d42c6c/zifokokorav.pdfIn PDF document text
    • https://izr.fr/files/guxakufetazad.pdfIn PDF document text
    • http://turnyras.lt/Files/file/fidanevivemidomob.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/9aak8n15tali3fg1ep6ofo9qb1/guzalomuturafonimokepuw.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/ce2634246c06eecbe52ff2d9287ccb83/16968479171.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/dasisodamexil.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160980f3ede4ae---90501848258.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083332edadd3---robopenivobaxemozolakukam.pdfIn PDF document text
    • http://ellev.fr/upload/files/nepima.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087e50d1821b---33793509902.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/b710616c52e090f0dfcc2d25ba3347d3/kafulamijelinesukixofuja.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ef401c097ce0a31b7ad9efa51f56e95b/divodidosakifafesigef.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/88747118047.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-17/20210517025927279418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=cantos+del+camino+neocatecumenal+en+pdfPDF 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_off0000d56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56A 19560 bytes
SHA-256: 7bc8eda1e8dc8bcbc002b4aefefc45ab85530c7edaba7e3b90c27e78fb86b136
font_01_sfnt_off00010730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10730 10812 bytes
SHA-256: 67db759f8eb6fd04aff0ab2b720cdf867b7e909e39d95b2408f1c3aed423baff
font_02_sfnt_off00012020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1