Malicious PDF — malware analysis report

Static analysis result for SHA-256 770842fd00510e5d…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 07:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: da9215001a689de3e53c972426c93c4a SHA-1: fc26882a0d35f419f64b028be967b5944ddf6762 SHA-256: 770842fd00510e5d7781f5fb55725dcb7b071a8e9bcd0cee3e52ebdccacc8c69
216 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, with a critical heuristic flagging it as a 'Recovery secret / private key request' lure. Numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggest a phishing or scam attempt. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific content, but the heuristics strongly indicate a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://ersenergy.com/UserFiles/file/78062591088.pdf In PDF document text
    • http://tyros-club.de/userfiles/file/duxaluvipimireviz.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/tikebigadi.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/068d8b13c72e98a5e396047e29a107d7/52763015411.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/zokemibafova.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/753511ef2d8b268178c6557458fded9a/satizip.pdfIn PDF document text
    • https://murten-hotels.ch/userfiles/files/mutituluxinuvudoxidinud.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609026cd3b32b.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90d1d8ea6a---45283163518.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/d083d4310f81d44f3525bf5a341d7e9e/begemawufaxeranoborez.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/50630311338.pdfIn PDF document text
    • http://wernitznigg.at/files/faritudetizaboput.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160897003b4d1c---94658908865.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfe5bee453a---varomabi.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/18503073656.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/wutalu.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/fapedukiwizetijanisipo.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ch2uih0jlq3e5d7kh50nkjra8m/77507853205.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/gukapiseta.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d761113431---75806534321.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62392fd3f---47966310705.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/rofibukurod.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/73004361960.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/87687128590.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/43827933380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=adobe+pdf+reader+8.1+free+downloadPDF 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_off0000e2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C9 10664 bytes
SHA-256: d76dfe853da2b5839fc033b630970cb4a154a26e51742fbff697774b38a26ca6
font_01_sfnt_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001134e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134E 17132 bytes
SHA-256: f797c115224f72867f7bdc230359308d0127627d8e2cdaded7a436663e2f6c1d

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