Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c3d9fde290d494…

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 20:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 04e7a22d20cc0e305129b7b7e7f06ba6 SHA-1: 02ee8842623cbf21754f4c9e9cabfe32f7dc2e96 SHA-256: d7c3d9fde290d494eff2e91484822a41dcd65ba7861df15be3a5e3fef0f77f84
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable due to encoding, but the heuristic firings and URL analysis are sufficient to determine its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/7eadae5793b376fa1929b7b6e7f8055f/64895690759.pdf In PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078826d96e5f---29524681647.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/zajojafedaba.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/6923751a53b2be2cdd3824a32a69c47a/83335829602.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6785693822---pibarupatobapupetulati.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/dolodigofijizon.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/33426811119.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16084b961b2e13---94278371902.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/51852035382.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/4b82f250bbd8830d271f1e41574acb35/24971113847.pdfIn PDF document text
    • https://mmszke.hu/files/file/jedibukatuxesobowesebosiz.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/91494791473.pdfIn PDF document text
    • https://congchung7.com/upload/file/rekoxipugotejakeneguluwu.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/zasiwusaxamalikozerirasi.pdfIn PDF document text
    • https://lemanssrl.it/file/minimeduwukodiwinivudelok.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612584ac8f5e0---28438109735.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/47770074368.pdfIn PDF document text
    • http://merwepizza.com/upload/file/wopaburatelavipefovagozep.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd9db61ab4---salos.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/4a32749c4e70e770d90f81ddbad3b1aa/bujelof.pdfIn PDF document text
    • http://lactopad.com/uploads/files/kudogobuxa.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/3c6a9f27b91391cbbf03ec43ca8913d0/20740995193.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/20896070598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=birmingham+street+map+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_off0000e2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E6 18248 bytes
SHA-256: 7d5e7f406771c752e9bd673cef199680df16c3d9ef33b1aeb97cdc1a5b0f28f2
font_01_sfnt_off000111e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FA 10832 bytes
SHA-256: 376f67c3c97bcf820e55a321502d554f7788e9e6fcbbf059de5364883ce9845e

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