Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c505e1dd426e365…

MALICIOUS

PDF

68.1 KB Created: 2021-09-26 19:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e1bd571f52140fa768e1b3acd26dcab3 SHA-1: ef395345e72808e2a2dc1ac91c8653f60bbec84d SHA-256: 8c505e1dd426e365127725cdedaa4510748af6db6e6ad016db87a887847e7c70
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector is the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://hasyo.net/files/file/45523235928.pdf In PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7e86439827b78d020e866f72a18d16c0/lapowezujupimomu.pdfIn PDF document text
    • http://blgjad.com/upload/files/98108462589.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fca98ed048---zojegefujiwexorupiropas.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/pamirafuxamujaxisaxewo.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9a73bf8cb---13968221582.pdfIn PDF document text
    • http://starma.pl/files/file/widanisifobuxomotixuvux.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/marazovixejap.pdfIn PDF document text
    • https://camphacement.vn/upload/files/madobazor.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/nonulijimodalo.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16140e35fc6f87---tofamuzebelexoga.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210914165341.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614046c43c415---pafosejepurerilutokoman.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/xixuwanipexusoxidixar.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613f09aa1d900---64756269348.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210912_7805704A6CD64A7B.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/84249981665.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1630623819.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/luwijupevibovobawobovowo.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/95850381632.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/kazutajovad.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/37225804515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+block+popups+on+android+phonePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD4B 14564 bytes
SHA-256: 318b24a935d0cfd3bed42f082b9a5a988b72e0b154d4a7a519931251fe83c145
font_01_sfnt_off0000d1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B8 11020 bytes
SHA-256: 9d772a7d3d1dd309b7ace9a49db0a2788201f47c86448882a8a2877e207a73b5

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