Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d69b0c79b2a5cd…

MALICIOUS

PDF

86.0 KB Created: 2021-06-26 18:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4c4353d2c60e1d2e4ed1af20b413415b SHA-1: 096ae681c1d4c1a151a7bc1ccc27ad63e5dd892d SHA-256: 56d69b0c79b2a5cd8da49920a6d3d7529f138f27fd47d62727388023245bdcb8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and flagged by an ML classifier. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The malformed stream length heuristic indicates potential exploit activity within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://allytemp.ru/uplcv?utm_term=mindset+grade+10+physical+science PDF link annotation
    • http://meyergarden.com/ckfinder/userfiles/files/fuvafadojaliwuk.pdfIn PDF document text
    • https://oumkua.com/userfiles/file/mikapupikepomep.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/f782bb20d52d497cd10db3c4edc8387e/bugivejureru.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16072f22722da6---badarunotijowokepadilejo.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/30fa7d81bbd6ae226adb3ddd504a190b/sadazajurixuduxazanubaga.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd439f4b11a---fasexere.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4b511673c---zewizawexala.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/52i62mpt2q5ob0282j192m70uv/tuzuvujegoxomopalolo.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba16a8edd23---69315688906.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/8742f8a27f4ceca2e9ff5ddab029fdfb/winekefijobor.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/nebexagegi.pdfIn PDF document text
    • http://zivotzaokny.eu/res/file/16684392358.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/qj62lcu0p6js3h23uel7e3fsvg/75371923080.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/82834954686.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/78811750237.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/s0kpkcnopigk00q8pdufsbetu6/fesumiwarisok.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c7af896a449---41549041427.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/9a8c0da3a1acf6516ddafd381a67c9d7/wabanerifo.pdfIn PDF document text
    • http://canvangdientu.com/images/file/rerobugedavigidokiru.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/fasamisikufave.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/5ugu9n0409hkppce5sc5frga82/muzominiro.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/gesunavuludodapober.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/60619065148.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/45224497891.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_off0000ed9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 16856 bytes
SHA-256: 213ef1d9a76e693f528b134ec998f61c549f5462bd326654e60076fd4a1aa17a
font_01_sfnt_off0001194c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194C 10952 bytes
SHA-256: 11704ca021e398588c567a3c58443645c80a1bced5728e0df0a9594e62856f94
font_02_sfnt_off00013282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1