Malicious PDF — malware analysis report

Static analysis result for SHA-256 43bb6a5f975d162b…

MALICIOUS

PDF

87.3 KB Created: 2021-08-09 01:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 446058a8addd07a1ba9130ba448fcf2a SHA-1: 14dca81f253dd3818d75775611dd5db0c0ed1af1 SHA-256: 43bb6a5f975d162b8174210ee1567f969dc3ff8250bd833351b6b7b1b639dab9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/f3ecde65de55c720651d9bbe14ba0388/wofajarowagaxomuzerasofab.pdf In PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/0j9811bnsai6m2boha962bqq1t/suzupifobaxesepolare.pdfIn PDF document text
    • https://ingmarcomantovani.it/file/43608283267.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/41bb3d42bd7d76afd819bb6cf3638fc9/moxamexinaxiwow.pdfIn PDF document text
    • http://short-story.ru/upload/file/8954585763.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca85a88269---sonanogomatos.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/sozerevekuvixunomosujof.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070021ece94e---34802255666.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210625101235.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/pifowonarenigamegexok.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/80254168642.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/29306420294.pdfIn PDF document text
    • http://email-database.info/userfiles/file/kalofoxesuzipor.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/mn4t49v5vhnomnevnfgsrj8cjq/rugixinuriwonow.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081e56be7c55---gakutun.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c38994383---figolivakukabaza.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/10676186376.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/k8pno2kd8p9u884n2atqpcirci/pimakevodud.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079d86b236f2---73160421066.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/kubuxasizupiw.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d864fb263c8df7b5e5f1b0de1af35617/33192499788.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/16614996613.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/1782588477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=mis+lecciones+escuela+de+pastoral+tercer+gradoPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 17508 bytes
SHA-256: ad952e7e7a695276a15894d732224a5864db411d6678052dc1e7643157cb334a
font_01_sfnt_off00011e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E35 10780 bytes
SHA-256: ed8568afd78cb3d19bc73a3bed3a4eb0fc21c1eaa0e147917baf516a3c87b8b3
font_02_sfnt_off000136ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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