Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d99d049c5d440d8…

MALICIOUS

PDF

79.1 KB Created: 2021-09-03 04:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ef5c9690d79b4bb734c0f5fe5abb0f33 SHA-1: cbecda24439546646b45e427b0faf98afec975b2 SHA-256: 4d99d049c5d440d8e938c12b6f27baaa6ed15ebd28e92fd04a8811406ced8b36
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to external websites, many of which are hosted on compromised or disposable domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077044e0e26e---getupaxolimu.pdf In PDF document text
    • http://iaestedresden.de/userfiles/file/5435606773.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/gefokofovosokidiki.pdfIn PDF document text
    • http://espwireless.net/uploads/file/93618641864.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/kejejujewixewi.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/32091039254.pdfIn PDF document text
    • https://baongochoa.com/upload/file/lamezavo.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210525/file/16219262803827.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/244acc5ee31d27c01974e4baf0d0ee91/14000116713.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/fawamijod.pdfIn PDF document text
    • http://ladue62.com/clients/2/2d/2d0487a90c18d3a1b3df44839405a665/File/wududenagop.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/a77b6462f92b1f661f36c7ec6d239bd5/foniwurexoxagixizapem.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b98666af26d---biwepitemijevewawodip.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080412a4f12c---ruwinukufonetiwubafebepox.pdfIn PDF document text
    • https://fototipia.hu/files/files/55471074781.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/damedup.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/43962589605.pdfIn PDF document text
    • http://houselandia.ru/files/ritavet.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/diguzelometitov.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16079c32642ea2---883567563.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/jixerewenopapujo.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c732906ec6a---mibajomofiwigodopijotu.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/dl3682tjk8drqale5ubfv751b6/fotuvategawag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mga+salitang+magkatugma+worksheets+for+grade+1PDF 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_off0000d00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 17560 bytes
SHA-256: 98f2f8b40cb4727afca0bfa8656cd650956bb9caf87b37662a9d7eaeff6d1721
font_02_sfnt_off00011507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11507 11124 bytes
SHA-256: 44038f7018ccb69ae2292443958694e2316e05fcfdd173499d55cbb4d6792e4d

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