Malicious PDF — malware analysis report

Static analysis result for SHA-256 42bab131af35afcd…

MALICIOUS

PDF

97.0 KB Created: 2021-07-05 21:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b40b451445adc4ffde4e9f59fe74c6e1 SHA-1: 05add4e6d35e885c2692f6ee62a4f42631cc9179 SHA-256: 42bab131af35afcd8a611f7eda4e043cfec9a958946440d97e769bed2cc011b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://chcial.ru/uplcv?utm_term=dull+pain+in+left+side PDF link annotation
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608484c2b26b0---gumobapu.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6801331118---nakavibajufivufo.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/05/file/20210705_105242_182.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/35bd777a296f3b753f9eddfb492a8f62/zinusomuxuvefaripunu.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/88452194936.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/860ca4c3c0381cc2d7212a58a3ca48d2/xenivujoxegududepug.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160891e80c3b52---42750000379.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/najofivem.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/b9c1fdbc299525a34642f50ebe65ac9d/2926873748.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb63b9d8dc---15339140132.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/262142476715.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/96471019672.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/kazateve.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160baac4e43147---tuzekaperozowesiredir.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/88317639668.pdfIn PDF document text
    • https://blogsma.com/files/7210541202.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/duzimitavukixopa.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/f82f934f67df65cc71bc02172ea4dd22/66843922515.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/df5085d2bbec5caa8643e224b80cbd46/notixad.pdfIn PDF document text
    • http://ymmicro.com/files/files/80045904004.pdfIn PDF document text
    • http://chikatere.com/Upload/files/59821037677.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_off00011af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF1 10372 bytes
SHA-256: 7639d3d5e816844813a5da1639473f8196f69d5f7bd5217a92c07ba36f998f52
font_01_sfnt_off00013280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13280 17220 bytes
SHA-256: 0e047f2250399ba692a0631193350cc6b473b820c634851b0579925bf9ed21ce
font_02_sfnt_off00015f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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