Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5ce9b7e275e9d2…

MALICIOUS

PDF

76.5 KB Created: 2021-09-07 01:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 162987f23957e857bbc8a128c56650f0 SHA-1: 2e4a92e73a463691a0f2a7f7eaf04c7be5f4502d SHA-256: bb5ce9b7e275e9d2d0bf4c6c5e751fefc9f873839cf6a2f2ab49fa9c865a928f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://mylodge-naoshima.com/images/blog/file/lifovimusog.pdf In PDF document text
    • http://gewald.ru/content/Files/73208389344.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079178d73d5d---siwavibi.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c6b13d661---10576382583.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/36819417764.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e26941bd84---58020357394.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210627_C698766EC4733A55.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/resuferok.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/sv307t0h87jnumo5pbqeuq49mp/nojedol.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/98453109109.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/e8f2256a0fc1ee0e4ff7d6c8f9fd8f7b/95051532541.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/fuwukixoxizufar.pdfIn PDF document text
    • https://fond.ru/userfiles/file/59055564231.pdfIn PDF document text
    • https://argumentua.com/i/file/88264622502.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ddedb1e6285d24d400993cf8134d3514/32698051565.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/dexojakinated.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607944747266b---41251534271.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f300e0200---zesifavowaduza.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/fosujufugijisuvaxaxonavi.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/64233862858.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/3677a5e30e79c88e7b1733969fe222e5/8035106129.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/67291569015.pdfIn PDF document text
    • http://allasclub.com/campannas/file/63827633105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pte+essay+topics+with+answers+2019+pdf+downloadPDF 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_off0000c651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC651 16652 bytes
SHA-256: 438cc32329d831ed7684001bba55e70f781a6aa5ce7898a599255bec8a6a1e99
font_01_sfnt_off0000f15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10976 11380 bytes
SHA-256: f4c85e3c5a5ccad51a5bfd665ba81ed80f838368fa9666ff048ceb6c6cfe64f4

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