Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b51a303ec541208…

MALICIOUS

PDF

79.7 KB Created: 2021-09-15 22:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 57da04004893a0d08fdf7e47bce15316 SHA-1: 52adb3e17a9bc93fd5feab8c0e3400f5cb2a9f69 SHA-256: 3b51a303ec541208d4331df3b9dc3037cdf4bc1ec4d3d39b0c2ee35e93b87b9d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites and disposable hosting, indicating a phishing or link-farming attack. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. The presence of embedded JS points to T1059.007, and the overall nature of the document suggests it was delivered via T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/1366a61cc68d40f04d0d9c98eeda221e/33279885228.pdf In PDF document text
    • http://abwmercury.com/uploads/files/45051472996.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/bogaj.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613931c71428c---9591580061.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d346b7c05---19115191667.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/maroxesigilulekar.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/54993152175.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f789010be7---xazivirefegevibesofuxito.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/94952934890.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3ba55bac6---vegemufozibubi.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/15951275242.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/11555652782.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/76189711030.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48436674019.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9aae81068---nelasinelevuzosoxeworota.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/5utsobdcli34r3l1khc58p2uql/31278233624.pdfIn PDF document text
    • https://uangraja.com/contents/files/45880328586.pdfIn PDF document text
    • https://e-room.co/userfiles/file/bijanerijaketeju.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/31961ab2ef910c5817a004103f4c6a0b/sefatizibaxev.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/69776916001.pdfIn PDF document text
    • http://tabletopad.com/images/file/14684888704.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/dufitagimonino.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/86294173106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=latest+version+of+tubemate+2020PDF 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_off0000cf0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0B 18900 bytes
SHA-256: 7fb21691cb53d389c5574450c0dba4a2276a1ab9ad2a1ed7cf2087aff8e00351
font_01_sfnt_off0000ffc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC3 10836 bytes
SHA-256: 858d904dcde6c57e55642f7df149c05eb0524af4975d6dcc5ca0416d83dd4de9
font_02_sfnt_off000118dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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