Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c51ac8c2d818f8f…

MALICIOUS

PDF

70.6 KB Created: 2021-09-07 18:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 848e503b0af5733f8122a117ae1c9f03 SHA-1: 060df47ac3cf65bf3438462f4e09ff3abb714ab5 SHA-256: 9c51ac8c2d818f8f191b7ed5f1f46b0d8b98d8ae007ac55a703b6f07e66b27e4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=hpas+2019+syllabus+pdf PDF link annotation
    • https://natatourism.com/userfiles/files/66221919479.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb515ed550---87876585788.pdfPDF link annotation
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e49b385c98---butafegojuxenurafap.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/96b3b42b880d1e50a36bca6a20e2b553/33153476468.pdfIn PDF document text
    • http://benrassam.com/uploads/files/53974459380.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/lanovem.pdfIn PDF document text
    • https://basisangka.com/contents//files/fagimivadabonoxofakukixi.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/jaxume.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/tuvanajakanisisen.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/52727993873.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0252e65e82---mezojebolonada.pdfIn PDF document text
    • http://glttek.com/userfiles/file/321835874.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbdb48b0ba8---loxifegegedaraja.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/klh77fdmicsrhdpp9k72omg3v5/95482770245.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/nebevapodexezujolitenima.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3ef3810a3---8235547265.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/meset.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ed1d797c8bb---wugoji.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/53462900762.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///jifilokakomamijafafe.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/17449485137.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/fegerojisusuguwifej.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaf3361a52---97501062786.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/mekujedetabiwatafonokodob.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_off0000b478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB478 15592 bytes
SHA-256: 21f56a09e6f392965af1d5c23ae2a732b08e1454e5e58c63b4bc71d55147fbfe
font_01_sfnt_off0000dc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2C 10652 bytes
SHA-256: 1ce2d01984a3a59cee51f374c76281b5b8df27cce700d04ccd09109cb573fe18
font_02_sfnt_off0000f48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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