Malicious PDF — malware analysis report

Static analysis result for SHA-256 7652a005e5d011e9…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 20:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ea18d89d7a1c1fbfb0c3cbd302c6b1a4 SHA-1: 36d3586c81b2c4796610e591a5c2b4b6df69696c SHA-256: 7652a005e5d011e957b197476f00720f50895280095aaa1ad5e6333586f2103a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, but the presence of link farm heuristics and compromised CMS upload links strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=plano+cementerio+de+la+almudena+pdf PDF link annotation
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/xanenusilokebezuperu.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/92884016107.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6c3558d26---96597544928.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/0coru9aqq9ke3op6cqj2oa85q7/11317099348.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210811234219.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/60790966239.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084229f1c835---58066878734.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/e286af6c2dc65739bdfa216a1b8cc575/buwolopimazapanujumuvaw.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/197566e6b26d8312ff3c04e08aebddc4/buwegabosivoka.pdfIn PDF document text
    • http://adveotec.com/img/file/57116713917.pdfIn PDF document text
    • https://85097781.com/upload/files/xalorebinawoden.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075525953c68---11637678711.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/44116209863.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efb6be149e---31846043365.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f4b934183---fixunasoweni.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/mibewomiwulumavebev.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/9b8946712739dfc2d08c370dfd6a6342/vakilekujozaxixubixifo.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/jexixo.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/jelanegi.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/najajad.pdfIn PDF document text
    • http://uci.ir/userfiles/file/kirajuvatugob.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/purepexaxigikuvonijidi.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1611ace00d3acd---58418489091.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_off0000db00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB00 19452 bytes
SHA-256: 95569c56de4dc4a4c8569402097349be01d2f6eb483fe559ee562d1a1f199e5a
font_01_sfnt_off00010c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8A 10712 bytes
SHA-256: 4d017c8ec219a26e19e66bcc649505b7f84d4c395be515a3c96e1c8bb80a6904
font_02_sfnt_off00012517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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