Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91af1295dd01462…

MALICIOUS

PDF

80.6 KB Created: 2021-09-23 20:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b295f3a1de525a3f0d7682cf1125763 SHA-1: b273a3c2fe22c46cf2ab6cf4688c6deb1545a63d SHA-256: c91af1295dd0146227199c21961f179141b9da7fbc2fe7115de105dcad11dc1c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicative of a link farm designed to lure users to download potentially unwanted or malicious software. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304dfbaf536---xuraja.pdf
    • http://eminenceinc.com/userfiles/file/funixaladosubisus.pdf
    • https://laatuwhuisweerstralen.nl/upload/file/68200151000.pdf
    • http://floramarble.com/uploads/35106729253.pdf
    • https://merohamro.com/ckfinder/userfiles/files/47540894816.pdf
    • https://xtremefitksa.xbodyksa.com/ckfinder/userfiles/files/60078767438.pdf
    • https://hongmao.tw/uploads/files/202109150745251744.pdf
    • http://podwierzba.eu/ckfinder/userfiles/files/22893139805.pdf
    • http://hoshitorionline.com/uploads/files/52386298734.pdf
    • http://c2r-auto.com/uploadfiles/file/2021091204574473499.pdf
    • https://anjingliar.com/contents/files/minimudomeriwimafefef.pdf
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/miburozajuwabijutazaba.pdf
    • http://85560891.com/upfolder/e/files/20210903152521.pdf
    • https://actorconseil.com/files/file/81250748220.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161445750b66b3---21678915313.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/8e02b4dcd6569f8c96b5da0899133f16/42720645396.pdf
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/87422502041.pdf
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/zujakawaw.pdf
    • https://ms1oke.com/contents/files/wunopapabedazudoxo.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405bd106f62---13754466540.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=frp+bypass+google+account+manager+apk+download
    • 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_off0000d582.bin
03f5425306bd36b35d6cb283c462a4d1c583ceb7da8b9d8255e43432303b7f45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD582 11272 bytes
font_01_sfnt_off0000ef9c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 16792 bytes
font_02_sfnt_off000107ae.bin
f766196e6c82debb289411c5b7e1bfd9e83b976af7365525282bef57bd0ab029		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107AE 17208 bytes

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