Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d9b657db284002e…

MALICIOUS

PDF

80.2 KB Created: 2021-09-06 07:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dd8af86ebfb293176d2631fe9c8fa198 SHA-1: 15412de5f98ccd732f7e334c0e5451662193bb43 SHA-256: 2d9b657db284002e6fcf2f053bfe0bc33c511a64d68317ca3d73ec9c986f8372
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many links pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/8e7c67ac9892f92cdb38212904039446/dumozuzeselaveraror.pdf In PDF document text
    • http://xn--eyt274i.com/upload/files/wodisugigerixilikemakixu.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/gabogimofuponuxezilatux.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/29777078811.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sedagudopapexaretesotupo.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/74539716283.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/292312928.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/41514295917.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/22151482135.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/46514157656.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089e5787c842---jidowola.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/xotuzepepotogokogu.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/fitojamikilutopeketigodu.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dea87c88fa60af668517dffcd268e3d4/35406502968.pdfIn PDF document text
    • https://airbays.com/userfiles/file/sepedalepokaropufetetawul.pdfIn PDF document text
    • http://stonebriarranch.com/clients/876969/File/gonag.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/wedesepavafamud.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/mutelokovezemus.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca0b6e9025---56202129036.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161251c49cb11e---toneviru.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/dpep4eecv0i7hdhbpitapruff6/gajirimuzep.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16128fa42acad8---rulok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ariens+snowblower+sno+tek+24+inch+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_off0000d573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 17336 bytes
SHA-256: 1fa6b4b8cf8b4ed79cab22982da4b42cda083df1808d0d28c54f0a93cd085327
font_02_sfnt_off000119b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B7 11092 bytes
SHA-256: 0c8bbe4713bbcb1a4d541cbd4dcd91b70e55ab003d619daaa20186bd3a9da6d6

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