Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5da4b8177ce83ee…

MALICIOUS

PDF

93.2 KB Created: 2021-06-30 13:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84500961a0d0f5681c486b2313be8e45 SHA-1: 078703947390bfa6cf48d698b8762b2ab0351c68 SHA-256: a5da4b8177ce83ee4fe735d98dbabc88e69eca165206dacfc776cc5dd14aa00c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, which in turn host further PDF files. The primary purpose appears to be directing users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9913325fa26d48b3b4799958809fbb16/wamuliwuf.pdf
    • https://asiarsolutions.com/userfiles/file/48016517944.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/216ae7c98c5760beafb3eb293e29a024/mewuvexademijikuzako.pdf
    • http://daimarconstrucciones.com/images/admin/file/rezelogamo.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607dab9884b63---kutek.pdf
    • http://chickendaylacrescenta.com/uploads/files/wikimofajosebipekuwajanud.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/998bd39a6fbf0fa7fc7787c22774b7ce/20300291475.pdf
    • https://fotoprint.lv/downloads/file/875724884.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ec1d302a6---siresoburararemow.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/e89imf2i5v0m83cta0a6og37q0/40484674548.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d74edac3fb0---88308944473.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf1ad35608---98087466195.pdf
    • https://stiff.pl/ckfinder/userfiles/files/rolonubetosotomadep.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d501b4ee1---mewitawosus.pdf
    • https://cristalparkhotel.com/ckfinder/userfiles/files/66304814936.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7478e350c---jurupokijidosefujatidomo.pdf
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/37451866560.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/qc66aht6i8mmh0gn8smsaqde54/70595011315.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/6a22abe10b1ef17379dd6318aa4a5ca4/jiviwo.pdf
    • https://atraba-holding.com/userfiles/file/zivonanivor.pdf
    • http://maekuangudomthara.com/ckfinder/userfiles/files/50853355364.pdf
    • https://epiphanych.com/images/file/26751882156.pdf
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/24539991769.pdf
    • http://yishiweb.com/upfiles/files/20210613_183532.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=glycogen+is+stored+mainly+in
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105e7.bin
3548ffbd0fef2d802d7a7a7ab30a1a6c829c30a017eafefe5a5705d9448bd12d
pdf-font-stream PDF embedded font (sfnt) at offset 0x105E7 18664 bytes
font_01_sfnt_off0001368f.bin
01d481844ed8945db40dfad06cde8a6bb2b2db14b9102d5783a9b3646e8b7f80
pdf-font-stream PDF embedded font (sfnt) at offset 0x1368F 10864 bytes
font_02_sfnt_off00014f86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F86 16792 bytes