Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c61bd6809b37f7…

MALICIOUS

PDF

96.3 KB Created: 2021-07-03 19:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37b61d3fd43edc82ce855c62780ffaa9 SHA-1: 357c8d70b2e89be88728fded6333f1fa489b5025 SHA-256: d6c61bd6809b37f7c285f98c8f3f9e544a1936b8bf29a772200c935bd6e2543a
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 ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://smidgel.ru/uplcv?utm_term=the+binding+of+isaac+afterbirth+best+items
    • http://cassotech.nl/site/data/ws/files/vixaxizalebenojitin.pdf
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/ramudifoxejawanajigonuzo.pdf
    • http://begemot-rus.com/uploadfiles/file/2021060523500173499.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/dd203b5acab20359b4d55f7f3c04d587/280458624.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092c029aad48---davukegabobof.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/95bd21a30284b59c11f711c5ecaab23d/lezelemazugonibim.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/e2c5b1a56a38d1661bb32c1c8fcc9e19/lifanusinagudotet.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/qvvv9b857uno8dinbif7abm0gh/53586510568.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/m65ar3c2lanjka4phd10sg6gh5/63651254485.pdf
    • https://apskarota.org/userfiles/file/zopiranuzudegamabijazamo.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b05a384b687---9102697928.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6d4d77aaf---46768156409.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/t8fkjkrhrpvkp6ni9aul33qc25/94406048965.pdf
    • https://tmtteks.com/files/savisipizofeto.pdf
    • http://hitecds.com/userfiles/file/nuvekag.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/kkrq0rnegnnof7aaih27qv50hu/39459837445.pdf
    • https://dalnoboy.com/data/filestorage/upload/files/26876457124.pdf
    • http://daindnc.com/fckeditor/userfiles/file/7019164098.pdf
    • http://geasit.it/userfiles/files/lojulasutadixetipumu.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607800b93f92a---molijomumotepuladi.pdf
    • https://alnahamgroup.com/userfiles/file/vatal.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ff0d6fbaf---1147971272.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17b694b7a---73897251305.pdf
    • https://ventadeterrenosurbanos.com/userfiles/file/murusifedesipatabolabewe.pdf
    • 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_off00010fe1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE1 16792 bytes
font_01_sfnt_off000127f8.bin
ec3f2b654f06c116e03621eaf386494ba2f5f67b7ce27bcaed7f7728292ccca0
pdf-font-stream PDF embedded font (sfnt) at offset 0x127F8 10980 bytes
font_02_sfnt_off00014112.bin
e1d9bb219c46ebdff6e1aa0f433204e05c6302cf63df9d8b4516355db3292b2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14112 19784 bytes