Malicious PDF — malware analysis report

Static analysis result for SHA-256 536084f4695b5e65…

MALICIOUS

PDF

92.4 KB Created: 2021-07-30 16:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c2951c38ab8ac9a311b23bac37fafd33 SHA-1: 497ef0b88a30d6a9994e93bdc5807eb7c7aeb591 SHA-256: 536084f4695b5e65b82c7e2e1b43db8dfd5a14cd7fed59c6f9f1c25becdabe24
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. These links likely serve as a distribution mechanism for further malicious content, such as phishing pages or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing-related trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://wastran.ru/uplcv?utm_term=how+to+reset+a+whirlpool+quiet+partner+two+dishwasher PDF link annotation
    • http://mazraeir.com/images/upload/files/sexikifuropemawedotu.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/3sgcsghttr29p22e77u9pars00/lazemovizelerizomolalo.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/ad6c73764c943cc928e2efd636e96826/wujumemowibuke.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/wijom.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/4aec8c69d31430be51b4b79768c6a766/14776827236.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/842dd76b2c3c60ba42c24af13e3ccde8/21854607173.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/texuzi.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/37602662060.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/keladepijo.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcc79bed82---48248027345.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/3d6a4086263cb3b777f01980ee61355e/91708899837.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/15ef0221cb711360792edf1aed757c61/1588074656.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/376c156cef57e1741d9a3accfd762416/37068920746.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/dmp9dhq89uf3k0nao6f6gl72m2/febivej.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee4178157e---mosegaxab.pdfIn PDF document text
    • http://www.asslar.de/downloads/33503861965.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/69528172356.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b40b46366c---65622125074.pdfIn PDF document text
    • http://www.celso.org/download/xipevugob.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f06220425---sawamitabaw.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/46320869382.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_off00010749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10749 10812 bytes
SHA-256: 8eaeb7a12035e0e4487bf47d6c3fbb2450087dc37e88b17e3dc79d7ab12d53b8
font_01_sfnt_off00011ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13808 16576 bytes
SHA-256: bee384070defa7e4dd1c6dd87ecb1a9438e7f0d8ff54c7e435663671d8aa141f

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