Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ee841e00ca5d36b…

MALICIOUS

PDF

115.1 KB Created: 2021-09-05 07:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4d45c56fc0af1bc9a83878182ef09978 SHA-1: 1c9459dd3764a5b0df0720922fb2c41a7183871e SHA-256: 2ee841e00ca5d36b799c50142584ab4489e2ffe4e59f460340a126e7a27d0f7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://inwebjor.ru/uplcv?utm_term=manual+do+moto+g4 PDF link annotation
    • http://tfh-filter.hu/_user/file/fixaretilotavidoladelit.pdfIn PDF document text
    • http://espressoperfetto.nl/app/webroot/files/userfiles/files/pomosilonuvijudafilo.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161128c12b2a2e---12452889109.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/19fafad4221fa1458aa96732fd9a6382/bapibo.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/wisorata.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/3vm78rf0ld4nck7hkmpni8frf4/gobipobojezixuriwejateje.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609886e695a26---zamomapotiwiter.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/nodasobu.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/10579435392.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/95860177497.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e6ace08cc18---riwikapomi.pdfIn PDF document text
    • http://wjcopy.com/upload/files/60525142429.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/21352973440.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/d71e48e2d2e8342365b3f87b71a37faa/8108110673.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f054f01473---87265144033.pdfIn PDF document text
    • https://tcremich.lu/files/files/jarenijasomaze.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/vejugasuwe.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/b20a2274e95466759df1232d75bca189/9820190366.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/soxexozinixenoweke.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/72248b115f6d2dd373aa54a70d7fe2fd/mopegukupadujuxetojuj.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/22084f4656ddf8c6bbb8669dcc8a94e8/novowagikovigafoduf.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/gc69eq38mbdh4quj06rg32na49/76387431418.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ac70614c1---zikodowipediz.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_off000156b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156B8 10268 bytes
SHA-256: 41e15afafe374674835a8fa5d91e8ca104fb840191796538fd5e440cdf74ad24
font_01_sfnt_off00016d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000185a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185A1 22384 bytes
SHA-256: 9c87d55f2c02244984e86bf06f56eb3cb6602f10408e870ab74a4cb10b5c7a02

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