Malicious PDF — malware analysis report

Static analysis result for SHA-256 971d5d2802f33d04…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 05:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10ea0cf9f06d00d21d9945e30cc02bd9 SHA-1: 8a1798376d37c257204f36bced3391464b3b4087 SHA-256: 971d5d2802f33d04dbc641eba6e0e397e3d24096ef926a5debaec59d5f1cb316
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's designed to distribute further malware. The presence of invoice-related language further supports a phishing or scam lure, likely intended to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4849fa0dc1c2c786002a0e222b6b276b/82133386650.pdf In PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611eeb1f86a1b---dozedarosesaxanemitemubob.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/48149679222.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/videvosetunu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608505bd9d58f---wowogidanerumuwosonuvog.pdfIn PDF document text
    • https://kopari.hu/files/file/gajolotabeseraw.pdfIn PDF document text
    • http://kammed.com/userfiles/file/murutudadabironitagelumi.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/79bafdcd48adcfaf39d5bfb1c751daf3/79862686694.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/57978684072.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/f57fcda76efad40e5e106d5e01ab3ebd/gixasufafiziwareda.pdfIn PDF document text
    • http://bvmnotarissen.nl/app/webroot/files/ckeditor_files/files/duligos.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/dozuxap.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/27795941800.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/u9ufa2cslmlb999ib12ebpuq6o/66290319020.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/papeterumipupado.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612b54b96d976---bufifofupew.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/499794dec8d4314b018541fbf1ffdc57/xalomutusanubujedala.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/tixuxurato.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f50ad344f7---12570146303.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/6d79ffon858hbshh4tgo9ofdv3/81140518546.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/94930053047.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/10637002019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=gst+use+in+tally+erp+9+pdfPDF 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_off0000d79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79A 10792 bytes
SHA-256: 8e67f723ffbe28244497a80384e16f54aed886d4170c3ad0b127dc511a921b40
font_01_sfnt_off0000f09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09E 17604 bytes
SHA-256: 338e707c1fd1863d2b013797eafd8d0e1c5bd5998621193c5fb72b0fff7d18d5
font_02_sfnt_off00011e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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