Malicious PDF — malware analysis report

Static analysis result for SHA-256 95deeff1d600f554…

MALICIOUS

PDF

89.0 KB Created: 2021-09-05 20:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b83628a39a81f4ec5dd3f2cdb01893bf SHA-1: 2fa01490f3aa0e465343ce2ee05c8853e524ab56 SHA-256: 95deeff1d600f554ba59290b6cf021cfcab529eb499c7c5e557dd44bb9476d57
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://seoulsquare.com/userfiles/file/ragif.pdf In PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/337177ab8d1bc4473c5d122061a85644/samoxitisajega.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/j8cun9hvopuu0b9a83fu72uev2/wigutezafopimeruzaf.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/tedinakamotemewata.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/546e11dce07cf197651f99367ec7bc95/80168380907.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/82139965611.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c77ea0ecc89---fenudoga.pdfIn PDF document text
    • http://thepducphat.com/upload/files/dusaxupefowuxozade.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/katepukaxereligipen.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16090f052c45b8---73588015125.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/pibox.pdfIn PDF document text
    • http://fpole.ru/sadm_files/fuwupoz.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33c759e03f---benezuli.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/nekopowagebano.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/qsermc0a8uij0ujva2cd0n4ni7/48133156929.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/13580928424.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6463471ed1---lipapogujo.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/tabezijotajetatopuk.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/0622f3563284736cbe91ab1fabb5708c/vumudi.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/sofevekomemidakonubitebi.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/92482740843.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/18148871857.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/863ab45ac00c9f1be2b2adcd60c26e7f/50911762525.pdfIn PDF document text
    • http://yongqingtech.com/d/files/tajipemujukavuzulugumor.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/u653fa2vkbkj08ujhcdfgnieed/94411005178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=multiplication+and+division+worksheets+for+year+2PDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF7 11288 bytes
SHA-256: 4d6e3ababb2a2e6930a5c54f3f3919917e7ba20c689333fe2bb7663169febae9
font_02_sfnt_off0001289c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289C 17476 bytes
SHA-256: a1d2679c418d7d8ee2ea8f55a924691afa34f440c8c6aaf4e5c91db901d6b90c

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