Malicious PDF — malware analysis report

Static analysis result for SHA-256 8482f7e1e18af286…

MALICIOUS

PDF

88.6 KB Created: 2021-08-14 00:38:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 724e43fa22bebca8441702af35aa93f1 SHA-1: 868e339d2486be4358d22b090144ac5513960949 SHA-256: 8482f7e1e18af2869192200a8c493e25d6b162061a5de56f22c04a332384de37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm used to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malicious content. The primary attack pattern observed is the use of a link farm within a PDF to redirect users to potentially compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1591594988---suziwapimafa.pdf In PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/691a9ed867ac74021cf71792146a1bd2/sevazatoladojosis.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/55ca103b10b29e4af08c8f4797931ff0/76324602531.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/dasesenamofiloxomalok.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/31343075042.pdfIn PDF document text
    • https://call-life.com/ckfinder/userfiles/files/92949038400.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/16832354254.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/venanunalewimuw.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609580480682f---48877118275.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160af82b173f54---59802280687.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/fa9c8651c6f614eb2d4be7e6cf2b39bf/buvefapibugutuvajef.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caf608adc62---23040213758.pdfIn PDF document text
    • https://telenovella-bg.com/files/zerifozijosedosaf.pdfIn PDF document text
    • http://envigest.cz/upload/file/58275545529.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/c9e1f7d196b7e8032aad2164f0082aaa/munanedakidojofizifalo.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/36802254950.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/farinut.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6b082a2ff---13341419123.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/58563372875.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/17480979199.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/49941636218.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4674e171d---69995480675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=what+is+the+best+business+card+reader+for+iphonePDF 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_off0000f64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64F 10904 bytes
SHA-256: 1deb399bca9a845676b56103ccf3b6b7b1cfe97fce1306c1789657be1f1ae5f5
font_01_sfnt_off00010f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F46 16952 bytes
SHA-256: efad566bd3c32945daf06f28bf78b4d992e302c8c95249ce5e291e41b114b530
font_02_sfnt_off00013b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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