Malicious PDF — malware analysis report

Static analysis result for SHA-256 4694b31b363bf358…

MALICIOUS

PDF

86.9 KB Created: 2021-09-04 11:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 16c3574a4bc32bf9ee4ac5f328dcac3a SHA-1: 8ffb3b09ee36b8cef16c11a7aacb7cc622f7a9b1 SHA-256: 4694b31b363bf358fc2394de90a4242656a1de1043c80f529980b636a63149f5
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://zold-kommando.hu/files/nukuroperugogupebararake.pdf In PDF document text
    • https://anhhuynoithat.com/asset/files/zemiximelosa.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/67734343911.pdfIn PDF document text
    • http://ge-mak.com/files/sinixafanifebifuparukoma.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b71f6f4066e---gozen.pdfIn PDF document text
    • https://factinet.com/uploads/files/dufiwawerasanasevuka.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/folexovavixaxemevikek.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/41764156888.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/97799116489.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16093ea40e7384---fovevorusefidubiruris.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/99951063976.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/7ca29ae3d07f3f1a0c5857687bb9f14c/94398665425.pdfIn PDF document text
    • http://caramelitos.sk/files/22246579502.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/nenofawix.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d8fc4782e---98862849376.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/rep78s4p238v49a2n0a8s5uhrv/tedomepoxuvixipabakejik.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/tudimodarixebametezukidi.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ac3f1e63f---vegima.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/banokufil.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/fefuvojaxazeg.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1626511044.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080460e799f2---23584716405.pdfIn PDF document text
    • http://mobil-tech.com/files/tebiluwaxelanuvapezasaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=summary+of+the+great+gatsby+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_off0000f1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C2 16756 bytes
SHA-256: 284befdd025bf8369ad17fb3c7ddadbba62a5e17ec6b5d20c5421ce231dec8ee
font_01_sfnt_off00011c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C49 11132 bytes
SHA-256: fcbb1aee0b9241983a18e31d7be71cfced001e870312b3c8ee8fa16c7fad4df9
font_02_sfnt_off000135e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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