Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7b7d070c418eac…

MALICIOUS

PDF

75.4 KB Created: 2021-06-14 04:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b213f6270c7638c2747f76a6f0430b41 SHA-1: e519f73ce0d8f7f004ab8b6448298527b1b32a40 SHA-256: ff7b7d070c418eacc0160e70b7ed4548fdf1fa03e7b77e9e260c5e3aa6ac6a5c
156 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing sites. No scripts were extracted, but the presence of external links and the overall heuristic profile points towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://cructi.ru/uplcv?utm_term=cute+girl+sad+pic PDF link annotation
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/5f161ed84411fb6d853176892a137f50/23840764444.pdfIn PDF document text
    • https://slide-bearing.com/d/files/62795900008.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071702d7729d---jewofoxufafowuzofig.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/17488246339.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/e2aca63ce8ee57bd7542f9a3e9378cc6/40483478419.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/wobuk.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/86017985205.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/074d68880a869f56bee2d7e09e12054e/zikakemijedepuwajuzagexun.pdfIn PDF document text
    • http://nb111.store/web/images/ckfinder/files/20210610011529.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/300359164818.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/89424624542.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/439035e11cbe4931ce1435c6b92fe756/61719706504.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/ruwevogisusidevupitanoku.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/f0eih1f3hh3pq68a10sotq2155/50300133843.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac95694e2b7---vopejagagazumizito.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070a74e03624---26428058855.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1e6e8c620---79878432365.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2C 5144 bytes
SHA-256: a3a40c08f7ff50d393837c88681d5bb43a03f71edb914bb72b522daff4138c25
font_01_sfnt_off0000feb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB7 9924 bytes
SHA-256: 8f532ef82dc2ec3580b9f96047293d7e87b95d1b4f640ba42df726dcd26a165b