Malicious PDF — malware analysis report

Static analysis result for SHA-256 36495a8514025fed…

MALICIOUS

PDF

71.9 KB Created: 2021-07-21 17:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2ae398972eca58c95bfc565e9751134 SHA-1: 761ab13c3face36dd296f2db3d005515f98c4bed SHA-256: 36495a8514025fed4f6832c4ad08627b58313c8b62636828e4da47ead3f673ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or conduct phishing. The presence of JavaScript indicates an intent to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910449090a9---87028684660.pdf
    • https://itacademyindia.com/ckfinder/userfiles/files/69098712322.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f1118b2eb---96965541527.pdf
    • http://eschool365.in/js/admin/uploadfiles/file/67993106474.pdf
    • https://paron-rebondir.com/uploads/files/mukobivivavesobowezudik.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088165c213b4---waxon.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092b897cc7de---jugemilewe.pdf
    • http://ledseoul.com/userData/board/file/29936311205.pdf
    • http://amajyuku.com/files/files/xazedomi.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094214e360f0---28264136512.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/93ede72ad49b7daead2d4c773bdd7959/kexonovinedulumose.pdf
    • https://melz-feu.ru/upload/lonovud.pdf
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/vovojolefelilobegakefo.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085be35a4a4f---19879698183.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/fd703f9fd001eff9bcdcda2d9917bba9/xuxomevoxolulixiruvo.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083df64e0603---55629972720.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073745448463---83739134615.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=glencoe+precalculus+chapter+1+test+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b685.bin
06b9af6baa00859ad931c40934a46da82957f4fffa1c709e713a1af2645ebcc4
pdf-font-stream PDF embedded font (sfnt) at offset 0xB685 16244 bytes
font_01_sfnt_off0000e091.bin
da793c4c7e5bc24f9bfe6c11a386a914bbb94871d024b7ec6574a1317d437094
pdf-font-stream PDF embedded font (sfnt) at offset 0xE091 10656 bytes
font_02_sfnt_off0000f914.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF914 16792 bytes