Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4407d66b1b6a00e…

MALICIOUS

PDF

91.6 KB Created: 2021-08-10 09:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: dc59e32c011dc54023f009d212b2b8c6 SHA-1: 3226bba74dfa553d91f6ca858ff7e564b824b328 SHA-256: b4407d66b1b6a00ea34dc7628d6a7755455849b84c9dc7f5d5fdb1894e71ce6d
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 0.9974

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://adepotcustom.com/UploadFiles/file/20210428200242158.pdf In PDF document text
    • http://www.kickcommerce.com/userfiles/file/17934824401.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ced7427c330---32153787806.pdfIn PDF document text
    • https://unitjaya.com/contents//files/wesetesuk.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/35476499015.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/88299490655.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c49ac6603---58188548362.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2bce16c31---kepatefiberi.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/sededaxapopenog.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/94552389968.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/rukavab.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607106fb2f0ab---69332014476.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ldh7f7l5o6ujsvgq0980l9u0mh/87082968835.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d51a18ef2b7---rofifavukodama.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/begowuxivobefigulu.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/90789118827.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/29ddc80e3870d76754045810acb09931/16518784449.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cadfac47d29---geregor.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee687ebda---78966614093.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcda7415c16---88922951115.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/bojeri.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/65408846982.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/kizotegez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=bowflex+pr1000+user+manualPDF link annotation
    • 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_off00010031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10031 10844 bytes
SHA-256: 0f777b2d6e494278d5ff5ff338c41d0e0106d00ad9e367404bc94ede2e83978e
font_01_sfnt_off00011960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11960 17612 bytes
SHA-256: 17edc0c505e5abd82e110f978d2331c5db369264cfdd7f9a836cd472a267e1d2
font_02_sfnt_off0001476c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1476C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1