Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f3c3bcf13d48e5…

MALICIOUS

PDF

71.3 KB Created: 2021-09-05 16:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f1065e136fc4b5cae30d67177b364ce6 SHA-1: 090f612224128ddbc8fdc0021140c07c317391dc SHA-256: c5f3c3bcf13d48e5bc950c0bed3139c24afb42b464d97532bc6a73438869f2c2
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/daaeb73dcb6ec594f6c440aac6b1022c/rabunirorumadusarukig.pdf In PDF document text
    • https://alianzatours.com/imagenes/file/82489299511.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/nobefifidijivilelukajote.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/e2b12362b3798a5897349a549cf474ea/9336980884.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/11009994907.pdfIn PDF document text
    • https://airbays.com/userfiles/file/95021329266.pdfIn PDF document text
    • http://marymo.ru/uploads/files/rodov.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/f6ualnnqo0aamg8d6dl3r68d07/pijurosorux.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f3924295a91e4a2546822cbf66f39c73/53551223157.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611545fce1180---58023126431.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/tirulorodunesafipozigega.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210622204527665.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fcdcee6ad---butogek.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e6ff77547---29863571389.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/5098f3742e1669f945323472e4607ec8/timajokawakuvutula.pdfIn PDF document text
    • http://veitali.com/upload/files/kifemafodoguvofefosu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4ba3a2441---51732093713.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/keh7asvpoua7lih5iij5f6ps63/41810118795.pdfIn PDF document text
    • http://tipresentoio.it/images/file/5398272774.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700a0478c4c---46466576542.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608622ce7fbf7---jusegigupojogikopakewofe.pdfIn PDF document text
    • http://honda-vo.com/upload/file/96832995442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=lg+gbb539pzcws+fridge+freezer+manualPDF 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_off0000b4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C7 11560 bytes
SHA-256: a4da9150bf4349b872c24ec1463e12d3b1ea7c47eb529869dfc8d614f6502e92
font_01_sfnt_off0000cfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDB 16008 bytes
SHA-256: 4d4347b574d1f92ab472e1509f6929f6d616185d6a51f382026bf95aa8115fcc
font_02_sfnt_off0000f808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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