Malicious PDF — malware analysis report

Static analysis result for SHA-256 fadf9d6b1b95f1d6…

MALICIOUS

PDF

104.2 KB Created: 2021-06-28 19:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ae118a7c25f037c06acfe33a06056573 SHA-1: d7c562788cca08705418283bfbde6e7e861469ba SHA-256: fadf9d6b1b95f1d6fc3b9d29633f9928bc2489267854200d5cc848356d81a2e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://medvor.ru/uplcv?utm_term=beowulf+fighting+grendel%27s+mother PDF link annotation
    • https://fulzugaskozpont.hu/files/zepam.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/veragijisisakinuwox.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/27010748071.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9ef6e83da---17470502328.pdfIn PDF document text
    • http://mrmax.ca/clients/9797/File/64885764897.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/9mdqpii036t7tg6iqhe7mqvsqq/6640449704.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086aa64b32da---15707310396.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/20e4bdca38e64b7997c3efd456e398e4/68376880413.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071224e58386---95974127213.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b6f22a610---48451233012.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a87f92c8c4---xusukasizomujinularu.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/773e1cbfdc9e7ab91eb17d5ee7dcca51/litubopofaf.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062322190252.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/19a9lq772raijl2sf0s70mum6e/26466396161.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c032bfef7---tivemazetuziburib.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2a3c618f4---67126294551.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/1lmonvpm0lbmdc7hjobujqto64/67092424072.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e865bd92f5---sivajedajivinemagu.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/23922663812.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/navutomojubofowemam.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/3198059467.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/58167078541.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075afb81ae6a---supelofanavogivez.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_off00013236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13236 17868 bytes
SHA-256: 7fcb36db173aad414a6f58233be5b0e450e30090c0229e91bcc4a713c5f7eda5
font_01_sfnt_off000160ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000178d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178D1 10912 bytes
SHA-256: fc651a019fc806831713e2b4e6f1fe0ca2f9f6c0bbf5331596d3292204993217

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