Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c329995210d504…

MALICIOUS

PDF

84.9 KB Created: 2021-08-15 20:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 113dcece000a6f0812b237655111a3b0 SHA-1: 89a08653ceedaf19ad413c98b3ef25afff76e136 SHA-256: 45c329995210d5043c9a7432d85b839d0885babdb1a44542a8ff982b7fcfd08c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the primary attack pattern involves directing users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://nomylo.ru/uplcv?utm_term=homework+3+isosceles+%26+equilateral+triangles+answer+key PDF link annotation
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/f789e2a5ca2371b53d370c0285fd33c2/mupoligopofabozotemo.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa363419e75---56921057855.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/wufirajodav.pdfIn PDF document text
    • http://mfahk.com/upload/files/12530268468.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/20039191632.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/bivuvaxepagox.pdfIn PDF document text
    • https://actor-conseil.com/files/file/29972964728.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/foduxinoxapobulonefut.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/a3d220f405d6b34e6a126e91533d3535/sijuwatirisuxebureboxiv.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/60e18c6c7ff56c607e62749bb5a2454e/39009447636.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98ce1b3e00---86063088301.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/fefefijulilutunazedis.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fc5be81d8---webisaxakowizoroniku.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/zajov.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/18600184336.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/womonatavakogigubomeme.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/xuzosejorov.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/19551928410.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/lujelakefekikagibejinu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7e68e80ba---kaloloperosowa.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608970546a7bd---tepixosugubu.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/fakafugezenizagutumamuto.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d892bc0717---22086424078.pdfIn PDF document text
    • http://fructusartis.com/i/File/9421257405.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/86804427827.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/kevujekamuzejarotufebanal.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_off0000e6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DF 10368 bytes
SHA-256: a8aabc240c52a6bcb080b820a965cd69fa2203e7a8c7ee4f060865302ce5157c
font_01_sfnt_off0000fe5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5D 18096 bytes
SHA-256: e9c2c19d773299a8f7d63cc879724846d959ebf8072058fab78ce0048ee38232
font_02_sfnt_off00012c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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