Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b0b75658ad0071d…

MALICIOUS

PDF

89.2 KB Created: 2021-07-24 08:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 270159397c0e8e6cc3b1e851f64d82a5 SHA-1: 936f8dc7b6b60096e4fb5521a9752c660a991920 SHA-256: 8b0b75658ad0071dd91761c2a86a0ebb2703aa56bbc6296bb56cd2f6a1e7c783
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. This pattern is commonly used for phishing or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://tbff-bygg.se/img/files/64455461449.pdf In PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/lukekakebozamozivetamib.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7ac03991d---tonurepikaxavibujukiwoz.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210621202602_5npxgb.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce053dad6d---lozifazopu.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1624355623.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074b8bbb16be---vumivevikopisomilojot.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094af3eae171---31785902715.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///39056933561.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/75257035772.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/vaxilobuwidi.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/61bbf8002ce1411984bbb463f1ecf105/95542983646.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/zagufesapebelewexejimolos.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/epn04b6i742if68f3en2s9mpg1/59400465670.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/22737333391.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2abf027e80---tigawazizutifunimemab.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/96345159854.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/99669141523.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/64011250824.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/62866320264.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2a17be28e---89173616977.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/ec72a2631df50f52ab79fe59e62a1f58/79102805961.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077501c7026d---75420329746.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/65149065292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+do+mosquito+foggingPDF 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_off0000f8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 17332 bytes
SHA-256: 4ee88403eb08355252c62c185db7ff7cdaf7240a6fa29089e1a647435af67489
font_01_sfnt_off00012634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12634 10580 bytes
SHA-256: 899c2cce1239d947d3652309b2838820b519472f34cbab7e97539414ab58fab6
font_02_sfnt_off00013dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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