Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7f28e653b5ccc8…

MALICIOUS

PDF

78.5 KB Created: 2021-08-25 19:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8386de30b363ae34bbed66381d27f373 SHA-1: 3e4a67c1665a93b8a137eb890d7e0159b056e2ae SHA-256: cd7f28e653b5ccc8fd66ef54cee55b273f8ac68c22220c0c510835b6c3ac4c45
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. Heuristics indicate it functions as a link farm, likely intended to redirect users to phishing pages or download further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=section+153+cpc+bare+act PDF link annotation
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/dpmpc2k46ffevasl5c6rcnt59f/xogibetakibomifafir.pdfIn PDF document text
    • http://haphadoor.com/upload/files/todekumebiloz.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dee42e1a965---43786001862.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/67572660607.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/jufid.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/nuwufuxixabivafelar.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/49141848707.pdfIn PDF document text
    • https://activepymes.com/pub/file/80503018004.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/63028839280.pdfIn PDF document text
    • http://soupworld.de/upload/file/46441107946.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/96dde9793b4965760b10dbeba3b4c605/34973200577.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/pofanote.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/tutasudonikafidik.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/56154804671.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160d862f035f51---10353011462.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/54409321046.pdfIn PDF document text
    • http://seedcambodia.org/htdocs/cljr/data/files/23251252253.pdfIn PDF document text
    • https://daismene.it/file/45415080873.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1163227e38---nufewosuwo.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087939b0d4c2---gujelojabekufivux.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/ca738a0e18d6a1fff0b730eada0a0857/78071097471.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-8-16/20210816181646962086.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f483e93e5fa---76592420832.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161030b7e78e31---99702388779.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_off0000d068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD068 10728 bytes
SHA-256: 501b73e85d1debb21edfc10297fc2416c59fe32a539c8f8e6635ab8968a3e51b
font_01_sfnt_off0000e906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10118 16260 bytes
SHA-256: 2ab37466025fa929d2e3ff805b80f5c4adce4ab7e60a46ae7d186799687f6721

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