Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5e2d237ee8dec1…

MALICIOUS

PDF

107.3 KB Created: 2021-07-05 02:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f25869a0976c7069917ef65173f2ba1c SHA-1: 4bf921aa23450bc8c6824dd44ae02d65f8f87481 SHA-256: aa5e2d237ee8dec11382a82d093640bee8d52f6fdbd5f7c23c25f9e272d66f1a
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent. The presence of a 'download' button heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tischlerei-schlusche.de/sites/default/files/file/juzaposaforirowubiriz.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/4f05216db413ebd723e902aae3b34e1e/42005963179.pdf
    • http://szymonadamczyk.pl/uploads/fck/file/99154037407.pdf
    • http://volamtuyetthe.com/userfiles/file/2805269268.pdf
    • http://2440027.ru/upload/file/xawezixovewile.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4e401f6ceb8b4986abbcdb19bf589e91/fogewobiwokafevutopar.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609794bbd3e40---2199082220.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079556bf1414---paginomatiwexewobarov.pdf
    • http://gayaarchi.com/userfiles/file/20210704210635.pdf
    • https://ryokanclub.com/FileData/ckfinder/files/20210701_F11096872AD41B2B.pdf
    • http://www.aadhar-interior.com/userfiles/file/26957858770.pdf
    • http://www.klimavill.com//data/editorfile/90392215809.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160757e552929f---30020581586.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75e5bb3f14---17629653903.pdf
    • https://spacio.hk/attachment/file/nadawuzizo.pdf
    • http://podiummoda.ru/userfiles/file/37643920565.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/6fd54ec1c0a2aa9e97f1220f31fdc22b/55271362431.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1366372b2---zikuvedot.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d893bd147c2---sadojizogozoxiditusofuni.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/6au2m4sn3o77mheu7j3m95v6ia/tusunaxadekewoliforodu.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d20548a239---jizoviripidejojefu.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/31040c464f7b01af40740d58033168a9/60816757207.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/3lnqdht6jslbcfd35aod911kc0/1659938161.pdf
    • https://marblobaths.com/app/webroot/img/files/83058178802.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=concentration+and+molarity+phet+lab+answers
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00017b8a.bin
87f4ff7a8a9b78c26ff13a57b289555cd8b12e6e7ede3681f942e390967eb278
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17B8A 21028 bytes
font_00_sfnt_off00011924.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11924 16792 bytes
font_01_sfnt_off00013136.bin
51be2df8ea8166c04c01a11fc4089e2bf1f6c6200bd3f9b7dc44a756c8c266b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13136 18416 bytes
font_02_sfnt_off000161d9.bin
16a92466ac6686b29cd19ed9ff0f603a35ff59abae5a88f1aba4ec92a9133afb
pdf-font-stream PDF embedded font (sfnt) at offset 0x161D9 11152 bytes