Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85e7c8d578b34d0…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 12:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dce27dfb7c0370229660b735429a67d1 SHA-1: 743db2edef058624a990c98ac3481f661438406f SHA-256: e85e7c8d578b34d0998a97cae2d6a776d5161add3cf8b71a5d3c08c5e7ceb661
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://wisdomtours.net/upload/file/77856893400.pdf In PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/vagas.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/23142475214.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610b81e180767---41288172661.pdfIn PDF document text
    • http://logansport1971.com/clients/4/42/424235dfd0fdcd2d3cc2afd1e16bb83e/File/48539013185.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a49895bb96baf77604a64e2299064ec8/76115857388.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/4824495f0ab03e22bf8068e2da74183f/nizesabesurugapitopu.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/mofupetevuvol.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/hpomjhh4fhl75qrurcegf97k33/vupajudu.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/98960246072.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608feb82bbd55---53725276419.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/8ade282a028b01a90ffc19190d6e0a66/68841999625.pdfIn PDF document text
    • http://juhaszautovill.hu/userfiles/file/59755459423.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/zilirorutusoxomijo.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/f23cb67d28cfc436308bea48ec833cf1/41014350514.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/63215987707.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096075504c69---98706257366.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/banaberuw.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/4g19qvmrmkit8pcgrp5h8u07oj/bowisajejalefawejapokiwu.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jawukavotamekebomare.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/59096116111.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be4d228065b---madurejatalo.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0b6c63885---ladakajiwe.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ff1500c96a733732a594024376747b2/pabibekuzukuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=picture+sequencing+worksheets+for+2nd+gradePDF 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_off0000db95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB95 17300 bytes
SHA-256: 2c7ae83233631a646288b7b0c0b9a3c48268200da1dfb07e97906d12f3285d18
font_01_sfnt_off00010807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10807 11252 bytes
SHA-256: f30865dcdce9ff369aaf46952ddecbb387b25b23df72e6bd548b278d5e02b2a9
font_02_sfnt_off00012212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12212 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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