Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f2e2dc0b5097d1…

MALICIOUS

PDF

87.7 KB Created: 2021-09-06 18:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6af24adfe3d5c2f5007cc03905b9d82e SHA-1: 8eb218d7e8e862ba955922230e2fb5d97a08892a SHA-256: 21f2e2dc0b5097d1bc2ee7a637a09feef6f90e07baafaf98b9043d80bf4a35e0
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites and disposable hosting. These links are likely intended to lure users to malicious websites for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://nirmalamathachurch.org/cms_uploads/image/file/5208175284.pdf In PDF document text
    • http://polyalpan.hu/_user/file/lesodiwosaduzadakubiwe.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/malunamisofeguxed.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161235ba76ea40---35342046635.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/64843d2a4443f27e37608bc80304fd48/gisatotumemetamibafinek.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/gesubomoradogilu.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/57916488957.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/26554403178.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/fuduzetora.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52288100838.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/jexure.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e042ef0cb2---fonuguz.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/e05c84e339a22714f223025dc44f102c/28024888584.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16074b428ab6da---62910989429.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/t1dn9a0upi5cbg4mr2qsgqqv27/31188605900.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/jugiku.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/9e86c9bd9080b0a94816cce5913ba7d0/89735202966.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/6606c26de7155312f16cf1a4c0ad4592/5400265613.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/xixipofuke.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/mamun.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcba86b1d3---96884370903.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/3fdg9hkldoqi97it0vh6iai1kp/figixuzuxigol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=science+activities+for+high+school+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_off0000f4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E8 16412 bytes
SHA-256: e0ece85c33810f5244912a3cbe656c35eb1057fa7e88e9cd52035a0322a1ce65
font_01_sfnt_off00011f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001374d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374D 11040 bytes
SHA-256: 50313f8f292de5cb6616a13654273d087f56d065f4cd4a7bdd4676a8020de569

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