Malicious PDF — malware analysis report

Static analysis result for SHA-256 166d2e6a252f9ffe…

MALICIOUS

PDF

87.9 KB Created: 2021-07-09 02:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2e8abbbad38888765b0e51de3c30d007 SHA-1: 8f4bb631e82dfcdbc9f3bd291502ba3c673f7546 SHA-256: 166d2e6a252f9ffe3824e9fe4eb268dcc4a386d43da19ffd2437c973d16466c2
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised CMS upload locations, indicating an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608991838f910---vukalirukidemaridibijal.pdf In PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/e268aef47f64f58ebb79f8c9657795f7/tobagoraj.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/18596645396.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021060303083827.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/43cf327f772f565403f15f4e4269bc1b/77122293656.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/26131351630.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/sunakanotexad.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/0d7a2a650366dfd3254164340d3aa78f/jabuwunadig.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160b00628dfa34---95808673791.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/gowaloxe.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/8427688422.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8fe5b0444---9009775105.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16095e4a9c4833---raxunopapakexanat.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/a9514bf3c20d2a0e74f9ad6fd3b63dfd/fafowobadada.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050319441071.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/94529473614.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/90419171254.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16074a3d525650---99715114098.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f2fa3d9ae---82752039443.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160888a03424af---61255381729.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca21d94341---21321520096.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/salikifabadobuvawitizuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=beautiful+birthday+letter+for+best+friendPDF 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_off0000f451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF451 17460 bytes
SHA-256: 83256cb8c4fd4cf3ae1d9d237065c8def2a65520dcea7ce0bee9140de6715f94
font_01_sfnt_off00012163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12163 10860 bytes
SHA-256: 620b31963b41fcc5ca6aac5e2fbff36134aff3486746d91f0b657dbdaca9f8a5
font_02_sfnt_off00013a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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