Malicious PDF — malware analysis report

Static analysis result for SHA-256 932fb781c98124a4…

MALICIOUS

PDF

81.1 KB Created: 2021-09-22 14:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8ecaa3f719ef1f2de840549ec4ee21d6 SHA-1: f864cb942bea9a5a2b848e567410011ee7eb4f60 SHA-256: 932fb781c98124a4d8a0d4b8e5c5e5851314a3f80961f882943a5e6feca1a55a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of numerous URLs, including those with 'utm_term' parameters, reinforces the phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://medvor.ru/uplcv?utm_term=train+game+apk PDF link annotation
    • http://satcomlink.com/userData/board/file/liritodazenemuv.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/18102735821.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/tisedanipufukefowawofum.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/79699734478.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b8dc1c4011dd6812093b9c710c16362d/jexiw.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/koribobewejivuzetokud.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/zuvovigijowowesedop.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/92122899783.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/29629712179.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rt0hrltn3stmfh2q5ms28ktli7/61657249217.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/fisepelipigabobagefuzege.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/54061206182.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/88755392773.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/d024c65da7705677de753765a32580a8/linunevijetodito.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/61726413189.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/piralovemogidojev.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/88156444312.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/63395244393.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fd7b0d2e64d5d7a89f837b805d0d1e9b/79067797481.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161349469d8437---59880979.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38388899915.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/wunevaruwunobulozesu.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/begipafenuvedekokemoli.pdfIn PDF document text
    • http://cy2hand.com/userfiles/gakituxizuforonopo.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/74397377465.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/c3592eac7556cc8c7d84112da48278ca/dasagazedopalotures.pdfIn PDF document text
    • 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_off0000dcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFD 16676 bytes
SHA-256: 95c2186cc5cd7c675b4f923e0fd8e6ff4cff91eaea9929cb376c238ee4197b90
font_01_sfnt_off00010833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001204a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204A 10220 bytes
SHA-256: 9fb483746d688c995f1907531eba787b54f21012b2885ae72a9346e5d1a388e0

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