Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a9d4683ecce788…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 01:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 99d9466de8994da4af3511f6c725673c SHA-1: 4b179b323db5b69f1bee5e994bc30f39fd6d6b82 SHA-256: 55a9d4683ecce788efcec08e8f2344b4a9a65f2fd2e59c359c3b5808931503d2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://oferta.lt/i/File/fomefifuxogavufijibigovu.pdf In PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/71842961087.pdfIn PDF document text
    • http://furniture83.com/upload/files/88228085931.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/00f297aafaf3fff2bba06cc9c3dad339/76470030858.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/3ebcuqdds6ggspvporv8drhes0/xowovuxetilepimikipiza.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/173942413a7a19bf5790b81045295b3d/49949538445.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/b7b625b8da7b499daaceb7da2cbfa0c7/34983856187.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/retoterakipera.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/3df0bc650db667d75cf4942cfde22ccb/legoze.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/zawonopon.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/tebapojororegigavidetu.pdfIn PDF document text
    • http://lecostationery.com/files/file/95188449417.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/eb3cd6dbdba369ea6074120275e9292e/wewuxigapebufax.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/97804033676.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/8bbf05b85ec5d11baa98585b288ffc26/fupofevi.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/vusedefigal.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/7csgv6drgmeqlrksh3ihobutgi/nuluwewobikimolad.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/36531194.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5ea0b4280---59359296582.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/kivawigevusaf.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/88443664731.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d146123ea---rokune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=english+to+spanish+translation+dictionary+pdfPDF 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_off0000e4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A7 10864 bytes
SHA-256: 3b0e509c16d9e43fbe1ac82ccd9c6721ca503b64541a7f05c7a662f05b9f8deb
font_01_sfnt_off0000fd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD79 18248 bytes
SHA-256: a92fe21331a725929fff2feef97153a415f15e8f324c0d6f570339062c597d71
font_02_sfnt_off00012c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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