Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ab48c65ead006b…

MALICIOUS

PDF

74.9 KB Created: 2021-09-05 11:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 990f9049e7f76bcd5e3791c409a14d79 SHA-1: 8f70c7cb56986dc9fbdf8727fda4641e958d4704 SHA-256: d7ab48c65ead006b3dd4f931c2efa3fca0e332ecc736bbf24ef9a79ce09dbd7c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to spread malicious links across various domains.

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 https://a2designbg.com/userfiles/file/90673269488.pdf In PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/6ef24db4a3c4886b36550cf0a6b4e297/runawe.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/23112654828.pdfIn PDF document text
    • http://short-story.ru/upload/file/pagonirewebeka.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/13487081041.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/43420037513.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/89041706061.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/29876632564.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/wazuzuruni.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/47596507380.pdfIn PDF document text
    • http://sgpeo.pl/users//file/supobewowapibut.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/4f55e766df39173c8302fef86cae9735/96515063053.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/kimugowatixumebedijak.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aeef6dc16bc---37439095060.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/vogowilovoma.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/20172559670.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/fanitamilixowigaxada.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/qhtbqaafg804knqto5pk909s20/50593802066.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/ceeee35cd92d3d3cf47c6e71f278d3e3/gokigemodiketoronavosev.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160ad94694cd22---22438604002.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/19300732882.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608af2273d180---86776621202.pdfIn PDF document text
    • https://projetovm.com/uploads/files/62735869388.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b995e1d53ae---texabajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=writing+and+study+skills+pdfPDF 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_off0000c27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC27A 16588 bytes
SHA-256: 6d040e99d5f97f5c5ee854cfea4bc7d57ed2413af3f3f03b0ece28e5fc2aab15
font_01_sfnt_off0000ed31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10548 10720 bytes
SHA-256: 28693f10b5ac1d70b1e8813f8fe2ca6160232cc4dd7e10884bac58215d5245f9

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