Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5754f76c05161b5…

MALICIOUS

PDF

87.9 KB Created: 2021-06-21 02:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 47e67af189c9d192381301e5af14743f SHA-1: c77787bef623fa72550b791a51ee314c87433c66 SHA-256: b5754f76c05161b5a58a98e59fc662d825a4e997a6a414eac7caf802c6d7f05e
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to external PDFs hosted on compromised WordPress sites and other disposable domains, suggesting a link farm designed to distribute malware or lead to phishing pages. The document body, though heavily obfuscated, appears to be a lure for downloading a book, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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://laborke.ru/uplcv?utm_term=agni+siragugal+book+in+tamil+pdf+free+download PDF link annotation
    • http://prtourusa.com/FileData/ckfinder/files/20210617_AAAB73A17F4320DA.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a2fbd3cdcf29cfdf80defe87a0a1411b/8745637186.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/ugiosbplal9e0jf0klb0sd71pg/mojupexelipe.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a55df1b14---gabijuto.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/asvsu0mlsgirnud606o35pfudh/89024541171.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092813fc8095---56980093782.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/542bd4f6ee04fbc1c62b057fdef1d70f/27967111978.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a66561ba168---puguda.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2642ed71ba98011c748b106e159c53cc/98685745089.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085263be26d9---kalagubevosoge.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/9052327185.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/saxuliguvejotazidafetebo.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/80555383700.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/11706197441.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/bivexaguzumoborumedes.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076559062e4d---vepadifixipow.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fadacedf71---newukasusibuwevevedov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2F 3212 bytes
SHA-256: 748e1223d06d8ac717cd07391261dab2073868aa99be05a5f720895b2c6390de
font_01_sfnt_off0000f7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AF 5648 bytes
SHA-256: 761d6ef692f1b75bf4b8702ec74a77ae888fd21854ce4c7e20158a24218e9a00
font_02_sfnt_off00010ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD9 5728 bytes
SHA-256: 181356e83146831949d8cb21a15e552e2bd37ee980656d62c0f614d1170bdb14
font_03_sfnt_off00011c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2F 11768 bytes
SHA-256: 8fc1d040cf27bab5e5a59419b478fe662b6a5cae6a66e2ae3d74816ac9c80a4a
font_04_sfnt_off00014440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14440 3332 bytes
SHA-256: d2b10d8ade125e2d681eb6224ecdb7ecc8918bc740947bb066102781950c04f8

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