Malicious PDF — malware analysis report

Static analysis result for SHA-256 783eea1a1b2afadc…

MALICIOUS

PDF

501.1 KB Created: 2021-06-21 08:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9b375794c2c021543172538d3c78f2c1 SHA-1: 19f5b771029894e39ff344709f72079b13d1def8 SHA-256: 783eea1a1b2afadc22db04b00a95828d17a0477eefa47a4f371cd5bab6946e7f
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document body contains a lure for "Purity crack download", suggesting a social engineering attempt to trick users into downloading malware. Multiple external URIs were found, including one pointing to a compromised WordPress upload storage, which likely serve as download locations for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9497

Heuristics 5

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=purity+crack+download PDF link annotation
    • https://sport-jicin.cz/dokumenty/pajukodovuf.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/b50d7f8cbb241c3f0feffc8ddb75f298/wopodosamibutukebowoj.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9d7939bc1---vizubetibitadujasuzezika.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7b19864db76cf098ff14b7a9616c6351/85768225642.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210614050628.pdfIn PDF document text
    • https://tavio.ru/files/file/57951559345.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/a12b0o1g7urjl6p803jhsu8b5a/jusuguxene.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/316ab0d3501d06bcf139a706fa5987c0/3723544053.pdfIn PDF document text
    • http://kleiberit.ru/files/file/80642257211.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/60747349224.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/wezejinan.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b12da35d0d---79533104536.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f376b77f0a---raduvimerewawaduvadavuw.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/41187356737.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832633ab6b5---22719025288.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00077e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77E65 4780 bytes
SHA-256: 8feae90944f76f7c39875a31b701285d5d1a26678f0cd28fada4c288667b2419
font_01_sfnt_off00078eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78EB6 11948 bytes
SHA-256: 5f310eebcdf1e7f448399d9136c29d9b3944a6d3a06d8804efec29ec2dd49a31
font_02_sfnt_off0007b75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B75F 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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