Malicious PDF — malware analysis report

Static analysis result for SHA-256 86772be9377fe711…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 07:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77dc99fdfe66c3c3faf0ff341f648af7 SHA-1: d8cd639a6f1042dd695d1887d0688f6f3640f5f8 SHA-256: 86772be9377fe711ef69ff33279c1ffff1270215256dd7bf03d9b6e6fdaddb50
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. The embedded URLs, such as http://sakesushilakehavasu.com/uploads/files/waderubadosa.pdf, are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://sakesushilakehavasu.com/uploads/files/waderubadosa.pdf
    • http://seattledesis.com/fckeditor/file/tupavubesozu.pdf
    • https://ta-taiwan.com/app/webroot/userfiles/files/zulimumoxoba.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d83aaa60fe714d64becd6ba4aa6afd41/mamoxupesa.pdf
    • http://jj-metals.com/userfiles/file/2021090123275573499.pdf
    • http://abwmechanicsville.com/uploads/files/44839409963.pdf
    • https://fertilizergranulatorprice.com/d/files/zidazemoju.pdf
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vunajifudaxi.pdf
    • https://batikatravels.com/userfiles/file/87864519641.pdf
    • https://afritransport.com/app/webroot/files/file/mafuv.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f3d646d2a---21433093981.pdf
    • http://linhkienhunganh.vn/luutru/files/doviwexox.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/2a89504a96c78c8af6e13588dd0fa99c/dufapepajimevun.pdf
    • http://thainightjob.com/ckfinder/userfiles/files/29519413169.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=kode+command+block+minecraft+pe+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d31b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD31B 16792 bytes
font_01_sfnt_off0000eb2d.bin
430b3767d97935098b34d058e03fd822ff8afa6b063397280b324a4e4d8b7c21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 18272 bytes
font_02_sfnt_off00011a4e.bin
4ea64b779700089a4a47b7a5d38849b19bc9782a0bcd31990a746d535d80a60a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4E 10836 bytes

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