Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8105dde0a4c418c…

MALICIOUS

PDF

82.2 KB Created: 2021-06-27 14:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31f295981f896ba8214d85f7bd9e3225 SHA-1: 5dd4b1414344040e46208c2ca267c2663c18dccc SHA-256: f8105dde0a4c418ca39731be04c9622eeccf77914a41aaf084f8c911305eacac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://store-connector.com/_upload_bilder/_filemanager/file/jirobolunem.pdf
    • http://cuatro-pr.org/sites/default/files/file/lemawepumo.pdf
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/85329068017.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbbba0e8d0---valilasupesomegoba.pdf
    • http://chanakyaaerospacedefence.com/userfiles/file/tafetabuzejiv.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160790be2c1979---88899876618.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a80275975f3---48225303748.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840730d834e---42092486230.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b24fb54d8ee---23223924679.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f941c5c37---38925620140.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6b34ee2b7---27462393780.pdf
    • https://manuscripthandler.com/userfiles/file/dimenux.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/5vj1d2f3jbn8vnh522vcqa5np1/52785874142.pdf
    • https://kodcomputers.ro/2664/uploads/buxosi.pdf
    • https://agatanorek.com/files/file/tapufewofukabiguwirajetap.pdf
    • http://anatolianlgs.com/userfiles/file/wexebad.pdf
    • http://kalikraft.com/images/file/nazelek.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077b21130962---2632286591.pdf
    • http://cfacgroup.com/uploads/FCK_files/file/momajox.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acff87a4a07---1322553900.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/f92a6daedabed191131a68f62be6ea9f/73453885727.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607214bf15b14---44553792253.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=subtraction+with+regrouping+worksheets+2nd+grade
    • 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_off0000dcc8.bin
c1e3ec3c11933a769ff1709012b9098839feee9d344fe58eb2c9c73c4e8f4e12
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC8 11360 bytes
font_01_sfnt_off0000f732.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 16792 bytes
font_02_sfnt_off00010f44.bin
a0730a311eba684deaecee5960eb0a7338d7408925e5620e6e40e42d4f1a9566
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F44 16900 bytes