Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc24b847375b94de…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 07:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ed3ae0ba6a2bd803f04adc9e65e8af92 SHA-1: 520da937058f3e503665deeea9334240702c0471 SHA-256: fc24b847375b94dea85e7dc0e54a5be585a184e180d0dbf47840e72c87b254a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised WordPress upload storage and disposable hosting, suggests it functions as a link farm. This pattern is commonly used to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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 http://clubselectionvoyages.com/images/file/29869878411.pdf In PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16206575161901.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/tt3emotm8ggqgbkaiomqi0nvm2/modalavitunetorelajulo.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/73963612842.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/db183325342d6daa01f5a2a2a3b7f57d/74903076426.pdfIn PDF document text
    • https://tantecoccole016.it/file/lalonu.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/kejotitefexajerilo.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/bisigu.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/kajujidoliraguwejubotiji.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160833dc415179---nufelezipufekil.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161156f1d767f0---mesexeveroxa.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b35d86e92f---4406483957.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/77011751443.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/4212773910.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/zewokonup.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb343a8b3f---taxefazapoto.pdfIn PDF document text
    • http://eternaseguros.net/files/files/fakogetafobibowirirub.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/seririvopazudaparuxuti.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/15408801298.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4b2299866---728899915.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/riwipogeworazel.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/vaditotokufilemade.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/rp92oqm9q55too9ac90as92bf6/10006918397.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/93553755662.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/1822332611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=extinct+the+giant+deer+reading+answersPDF 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_off0000dc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 20088 bytes
SHA-256: 82e58b93804b3421dd53f4b183343980c4336c8b4fdf17dad75ac5e9cb0613ae
font_01_sfnt_off00010f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F62 10656 bytes
SHA-256: 3ffbdd61e3b9641bcecb2c651206a8f1b4218523d8e2a6592b67b188f8606654
font_02_sfnt_off0001279b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1