Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf5d18a0f2e885b…

MALICIOUS

PDF

80.4 KB Created: 2021-08-22 08:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8cee48710d085fa4a8b44d40441c5aa2 SHA-1: 405ca0e4c03ed0ccd3f18935844db0215b00095f SHA-256: cbf5d18a0f2e885b71cca6c536f2ea506789465795b19015ebc6d9b96a805d99
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute further malicious content. ClamAV and ML classifiers strongly indicate maliciousness, and the structure suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://murten-hotels.ch/userfiles/files/sofimofupelawif.pdf In PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec8bd91505---niwiromuki.pdfIn PDF document text
    • http://scpt.it/userfiles/files/foxatubewi.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/vidagalevozosewazaniw.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/rubobojibevegofasifivim.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/44645224893.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/jelaselef.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/0kk0s2t6l2kp8bj22oe99q7pp5/88743119673.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/xuliwav.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/fizogoburapexobe.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/0ji3j4ovkpu5tl07a1mn2k9v9v/bipowazozebemuvawu.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/dowopati.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/ks411bi45hukhujl5mq6oiqkn6/31344170225.pdfIn PDF document text
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/zepalidotutopemiro.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/2394c52005f9952cc7a4bdd56943bfe6/29683549231.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16086f1ca18c21---jomosezuxidev.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607145ed0ed40---38991740708.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/61227291972.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/56997557945.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/69641335751.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e87ff19ba2---sosaxakow.pdfIn PDF document text
    • http://cocoal.com/uploads/file/dilewonalisozuje.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/gasonolagovotis.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/sepidanilititikufabadunar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=musculatura+agonista+antagonista+e+sinergistaPDF link annotation
    • 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_off0000dd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5F 17500 bytes
SHA-256: 1a19cd2402b410b705e134513f279b1316ae982774d02da2c53852d80af45bec
font_01_sfnt_off00010a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1D 10496 bytes
SHA-256: 22e3e0ae171d73f28ef309e57958f91d8e995b0c4d8ed8a9c24352a5b3b318ff
font_02_sfnt_off00012229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1