Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb9e60898606da9…

MALICIOUS

PDF

84.4 KB Created: 2021-06-22 13:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8037854e701a699edf3885f363d2efb3 SHA-1: 7fbbd8a1fd0e8fe37812790b2e13d3711978b59d SHA-256: 4eb9e60898606da98362b31df65347be551d8402d8cad1e1ff64a9b14af06d61
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of embedded URLs and the 'Visual download / call-to-action button lure' heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://oniceh.ru/uplcv?utm_term=the+devil+and+the+dark+water+pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/707a1f00f33694fbe6ea4398cb38a067/56392414839.pdf
    • http://abnicum.com/files/file/84733581991.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2257ff37091ca5a3babccf5b15555448/xabesizesubumaput.pdf
    • http://huiking.cn/uploads/file/190234002934.pdf
    • http://alphasigmaoverseas.com/userfiles/file/45921147958.pdf
    • https://szabobuszrendeles.hu/files/files/86444765401.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/v21943u3443uflrckbgjc4d5mn/lonesovamikixasugixakav.pdf
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/dazakuso.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f547cdd052---52954858545.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1f6180dd6---67121332712.pdf
    • http://perles-del-beya.com/userfiles/file/nafotatanujojoxivolipot.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dad29c5c72---50047219339.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e19afcc5e9---65902119642.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f3f5e65de---favogozolarifimavepezon.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/tebohhjd9ic3jcddeb2fu52ggd/gurivebajeruxibutid.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923fe8eb096---wevesikamugazalulusaboku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00010af7.bin
e24fc05d944fe8e865ab7774c2e9b21982103592e997aaf514e12be32d8eb36a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF7 5116 bytes
font_01_sfnt_off00011c6f.bin
9ce8e46c21cbf53216a38cf5a42cc3dc06dd66aab18d9eeec0a03ad98b0b5c45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6F 11348 bytes

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