Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1002fbed408942…

MALICIOUS

PDF

85.9 KB Created: 2021-08-08 22:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 4ff19c7d60387f92bddb25b1315ce59d SHA-1: 927b1b20ef17357d2f577fe8caaad98354883c62 SHA-256: 5d1002fbed408942ba0fbb3db31f831537756b0387cfb495b2e1cf2edcb71126
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous URLs, many hosted on compromised WordPress sites, suggesting a link farm or redirection to malicious content. The PDF structure and embedded URLs point towards an attempt to trick users into visiting malicious sites, likely for credential harvesting or further malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://crysiq.ru/uplcv?utm_term=rotativa+pdf+mvc+documentation PDF link annotation
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/3j9ho4iedk9716oh83vu8q8hg7/novavojoxan.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/wosapa.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/tejuxiper.pdfIn PDF document text
    • http://simpelms.nl/userfiles//files/kegubugikobitimonon.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e5af787dd3a---77265627980.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/njui3fc8rerq1tkoqkqsr53htr/80740906723.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/rudiremor.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/aafa39821c13c0f1db59484f8cd502f6/benolurikabepifofuxele.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/mufiwodunufulutuxogar.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/15457864134.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/b2375e2470ccb9961ffa1fcd2d0bd64e/58008916729.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8d79a5b64---robisagotonigu.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/17210789688.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609905efc54ea---41324611656.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c95c8801b3e---kavotodupusonabifinibi.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a19f443fd6227c809302e0ac04472731/94924760586.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/fuxumujomi.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a2d8b2033---27100790213.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/towirozugidegawasabeze.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/d27541ee98ff4556c7491ffad21b2b26/noximoropaxi.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610bfc2902a8d---12468539357.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/gosilodotonateditabudolen.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_off0000dfa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA1 22960 bytes
SHA-256: c92e4c54f654097b9acae80f3cc55edd810fb0c10414e536abe6aa9758ac2b6d
font_01_sfnt_off00011900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13117 10680 bytes
SHA-256: 13626d67f3797d8bde2bd9dadeab8a541ffb512994eb59c64f6e4741a2740ccf

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