Malicious PDF — malware analysis report

Static analysis result for SHA-256 f64865ead3e6cd57…

MALICIOUS

PDF

99.3 KB Created: 2021-09-01 23:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7d79d9b4126955212ff11982af363d1b SHA-1: e078f8caa3102d9aa48450409f674a40f6cce008 SHA-256: f64865ead3e6cd571e93a331b8c05de6a169b6e60cbfe00069b641abf71ae355
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of external URIs and the overall structure indicate an attempt to direct the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://krisoc.ru/uplcv?utm_term=monopoly+mario+kart+instructions PDF link annotation
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0b991b87c---58895251610.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba06cf615e3---gudotibegop.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607247533bb0e---73445440162.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/taduvesujuf.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607556c26ca89---68805959206.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/u2ooopb45bbgbf7pl45ef00c9r/lojewuvuwoxebotuxuvetuja.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/65129863619.pdfIn PDF document text
    • http://splogservice.ru/content/file/17657703521.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/jidurimuli.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/eed5a59fd7316351239650176a5efdb4/55175973439.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/54494400196.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/30602906874.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/ruzerikalewaton.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210810_191344.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/nejinirivilerifipesatu.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/8svsa3hqmfg4rv2kvhr37pif67/vizodut.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/zigirotakilepovupuf.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7afd9a8f8---difexeligurarirejeb.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/83494236595.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/gifef.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077c81dcf5d4---34712401578.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c04e9d67bfa---tajugiridinor.pdfIn PDF document text
    • http://hebertfamilyreunion.com/clients/3/32/3272330ca4c68e8b1120eb7f178c7a05/File/2345239905.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9440f37ac---wukik.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0154c4b180dca1763212131dff45ac7e/84910433910.pdfIn 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://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_off00011a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A24 10700 bytes
SHA-256: ebcdd70c794da93d861a9a8d7ca2276bd103e6eb060a9ddc9755f8b142d2cea8
font_01_sfnt_off000132bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ACE 20028 bytes
SHA-256: 2bb1112a90d21c308aae88929560e5a5c9fa6c5e30df9df4780bb260a0f26ff1

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