Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c5799f0a75372e…

MALICIOUS

PDF

96.3 KB Created: 2021-06-18 05:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2678263b762e7a384b66fc4de88bbe0e SHA-1: f368fa1193c8d7d6618a6128135ce2f0977f76ee SHA-256: 41c5799f0a75372ed632dbe1ba74ae2534efbcd17b3a04727b4f558b4e57acfc
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farm heuristics points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa472a8d36---kovegugobep.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc68d514b4---75544821262.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf47e998c4---womofizaw.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2020c59e0f---watenefowava.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/14975mi2embc1n9kja5r13ug52/88152764775.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608670494c6ea---1631600376.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/b599db807322c6d92e8d79a502510aa1/70959820323.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ddfc21f57---33924876478.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083cf64df720---wewejonisomal.pdf
    • https://michelbarbot.com/upload/files/kigefilegunajakex.pdf
    • http://alpha-cp.com/userfiles/file/zagerafifiwogosobiza.pdf
    • https://communeouchamps.fr/userfiles/file/datagegujewopimejabuwiv.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/37202884022.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/df1e3f4751c0545fd2de29525891839e/molepavikanurenafovizom.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b1be0a9a5---39712171728.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=hollywood+comedy+movies+in+tamil+dubbed
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116fd.bin
52e3e44daba788c5122dcf3e70718e43e0051b140b4ba4c36cebb6593f687abf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116FD 5344 bytes
font_01_sfnt_off0001292e.bin
796798eb1ff3c24874ba34b7e3326b553aa56fa911dedc19595c7c87eb748911		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1292E 7616 bytes
font_02_sfnt_off00013f0c.bin
9897de8096a6c9a4768c5179e811c2bdcf17788cc9e409501dbfa80274fdd5df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0C 2992 bytes
font_03_sfnt_off00014b9e.bin
72f87014418a1722266fa0991d87b17fbbb47d1c28db3a07f893e77e675b8e01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B9E 11652 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.