Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be8d762704efb6c…

MALICIOUS

PDF

79.9 KB Created: 2021-07-04 02:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 40f98d3b01c4afa70a9afa3698d7bf38 SHA-1: a4a46d580f371f3562f8f19cf6b6b24e15ae9e4d SHA-256: 2be8d762704efb6c4c6f7ae9ded3da0645f95acdecd67613eeae36337d289818
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML classifier score. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a tactic to obscure the true malicious destination by using a large number of redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=understanding+public+policy+thomas+dye+pdf+free+download PDF link annotation
    • http://mg001.cn/upload_fck/file/2021-6-14/20210614004919883975.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/1561e3c5b2ae2460030173a699e7d0b8/puzufageg.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/69104754881.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/edbd6fef71e42778a009a7ecaa24f977/gobaranekazejijafikidijo.pdfIn PDF document text
    • https://renault-service.com/userfiles/napuwi.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/molixuworiwevo.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/85943229984.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/25954887446.pdfIn PDF document text
    • http://pi-consulting.ch/download/xibanipebuzeromenakax.pdfIn PDF document text
    • https://robertbah.si/files/file/36726470004.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/joxubikozoluwegu.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca41bc5f1f---69302477399.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbefdd5828d---3199190933.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d41410765a---doxutinivifuk.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/570s98ifm59n2eo5rcj3ovnot1/jilobaketan.pdfIn PDF document text
    • http://18554080.com/userfiles/file/vasagituduxafalap.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/94826059155.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/nomudifewaxalogok.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961e9caa4d7---daribumopedo.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/32775469968.pdfIn PDF document text
    • https://luminex.pl/upload/file/5641555154.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba734635d---votesatitelezad.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/sanoxuje.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160776c8c0e68c---41131194028.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_off0000d444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD444 11512 bytes
SHA-256: 0b6ad95ca4c1736e27b437b15dd1248e7a13611a0f94be7b8fc4e2a4f8299a0a
font_01_sfnt_off0000eef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001070a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070A 16408 bytes
SHA-256: e0e3eb39aa6c045da9c6a7a8ddd80bd2050c1bb333d529f152843a215bb1c9f4

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