Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a4aacec15e16ca…

MALICIOUS

PDF

87.2 KB Created: 2021-07-17 00:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 00c94705f569c789a77a667dbe3ed511 SHA-1: 21d8050840ecdf193d4c554e5e17e61168871f7c SHA-256: c1a4aacec15e16caa931115b33e9b4afd3a592103ff96d0792fe8cc7569a10f4
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirm the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608382e84badd---fipugirivupojegidigav.pdf In PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/3f1407b4947cd44596c2e104cdb9c9e2/68699503587.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/juratigixolifipune.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/43681024198.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/e90bc0c5758285861c607210f4e0ae9a/pevavosedebobovurijid.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-21/20210621215806724863.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/f3c8f5dd1fe21e9901f0b0de3b888a88/lifiwabi.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/51105914311.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/04d028df2787d57ecbd1041c76f5ef01/rezufotatu.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/59ddfd98f16b43129dd0272fc106e0e0/96114910393.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210629_EEC157266D056EDD.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/xamalozobesafuwavasu.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/16314910665.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/0513305124.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd38011b4ed---72334802122.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/6d60f6ed1fe0a516c7b98b17da41e016/5384570750.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/35941301156.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/187039837da30aa1a0e44649fa36b9a7/67287832730.pdfIn PDF document text
    • https://wsbtitan.com/images/file/kekukiminarujotu.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160af8b86807c2---8145458389.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080e543c2831---63643132125.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/tibifemitidulejoluxisuvov.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16089c3b64b984---bepesaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=psychology+chapter+4+sensation+and+perceptionPDF 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_off0000f011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF011 17724 bytes
SHA-256: 00fe9fccad1d178560e33ef545505e53cfcd32cce30542db25b09a95e688cbe1
font_01_sfnt_off00011dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D2 10984 bytes
SHA-256: 1c73e08d43436ce4e79b10bd4949edfa73377291d632cf916b434ec354c30065

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