Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed0226345db99981…

MALICIOUS

PDF

109.3 KB Created: 2021-07-07 20:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: a806a87f05a6e419f33ad38dc127af99 SHA-1: ac074e9056df4e7baa4835808d2b52b98f3aa750 SHA-256: ed0226345db99981be44c53f5ca836fe21d620bdb88049530caf6b321b3b3ace
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609cecad86ffa---sozosiseratapexijeliz.pdf In PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/h1a47rjf6hvnnrgdjr1tc5p2c5/55596957036.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/6890902755.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/77556187088.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/41903013214.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/bekagadimojogujudegi.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/22095996911.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/36870603008.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a23e81eb27---82384957607.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071c194f0cd2---basilamafekebux.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/lazufivaxemijetos.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cef261289d---zokoxuwevakutiborodume.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/93449346019.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/438ced5d7c8bb50322affe7caf0e1979/surovogapubigokewumobezix.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/95354783271.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/xexolorok.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/52ce6111233c8e337c992b3faa51cfe7/54446288264.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071d60e83ed8---pemifu.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/e8oor92uresrd37h3q8iphc3qm/27861582966.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/30055825520.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/21208545716.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cafaf3bb5f---18865401219.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/109fa457e0ea3bbc6cde4564dce15f3e/mujusuku.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b042172e5cf---nowopenikifateboxel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cod+zombies+cold+warPDF link annotation
    • http://irodori.kir.jp/files/file/5604934420.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_off00014740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14740 10648 bytes
SHA-256: 09a9c89e0b15043352b647d7e0a494cde2238eb7a7ad1595a9ca6afaba0e3209
font_01_sfnt_off00015fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FBA 18272 bytes
SHA-256: 2a31976b86644cb3d353acdb9cc281ee35b9d80c7a512b547d4fab6a3b6bbb1f
font_02_sfnt_off0001900a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1900A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1