Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e327732fed0697…

MALICIOUS

PDF

69.3 KB Created: 2021-05-25 02:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 933fbd7b0426eac073dc285970b8e7b0 SHA-1: 2023214cab1e5dd52d9cf3de3621c2d3f8caeb14 SHA-256: 91e327732fed0697376f3cb44aebcca3c5bbcd41f7525e1f49c9484ad616eddc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to host and distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a74a98129---kekoj.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64e784abe2---susub.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16077c0a403f65---8339840184.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608908c9ca700---81716062495.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8452fd93---karotaxata.pdf
    • http://ufnk.fr/app/webroot/files/file/30552335739.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16071f9e304487---zujar.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/5746b2a0e1619767568b9171c86f259c/7665480621.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/59u3kod6n5rik6oorh0b7mbrfo/50039908372.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078ad07b3a3d---rigelamorojopigamexid.pdf
    • https://widepolymers.com/userfiles/file/lefarasabifapataxinisi.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085f709d7b76---zobezejitedepovedefawibu.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/1fc8d3a79bc7d434d04000917508b04b/gizosaga.pdf
    • http://airconbank.com/upload/fckeditor/file/61625121026.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+fix+a+frigidaire+gallery+dishwasher+that+won%2527t+drain
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d048.bin
091ac78c4ce3acf59de14d51e263629fd3546b1ce74d48351bef9f2ddc541817		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD048 5428 bytes
font_01_sfnt_off0000e2da.bin
1a6f2c4245ff765e377fae7b08fe7eab0a1a8c53861b4a4c85e6dc0d303aff22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 10268 bytes

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