Malicious PDF — malware analysis report

Static analysis result for SHA-256 957f16fb624ee0be…

MALICIOUS

PDF

85.2 KB Created: 2021-08-18 22:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc8f20e450e2e84b3fd9173dca9a6189 SHA-1: 267aa6d185f4da58d11dfe6a123d0205da6edad7 SHA-256: 957f16fb624ee0be2dcb04bf51dd7e49330f7f49dfb94ecb9d2eee8778368914
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or serves as a phishing lure. The numerous embedded URLs point to compromised CMS upload directories and disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://hagepoorter.be/files/files/jitepejanogevadagetezo.pdf In PDF document text
    • https://shop-ecobati.com/medias/upload/files/gibuvubapakagowase.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4bdbe21503af07a274728ccf1c447525/gemevuxanorixawenulavaga.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f820e078ab---kudegiwezino.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/571a94a38055e686a1f910e6be4bb9a5/nuditolujodurubo.pdfIn PDF document text
    • http://vce34.ru/attachments/file/sedupikijetekowurevutobal.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e717d56dc---26384501481.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/vozopufugusupavovife.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3507b1100---wegudatigatekegebifixit.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/687d2025df3e0310098e6ed64e88f9dc/xesotaduzavamipenibazo.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/51366851682.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/9280095319.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/golisagijuza.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/wolaparogu.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/62854370965.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/ab55494b5d7bbdf9a5bf53e6b12ad0cf/newikipelefake.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/90897854780.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/70805705978.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/domij.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743d1fa0c6f---96993268433.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb27ed08af---27499972996.pdfIn PDF document text
    • http://theshippyfamily.com/clients/57051/File/bisiriwiw.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/13580928963.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/mapinisajitobor.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/56610869827.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/41114399299.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a833d88d06f---goxaduw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=1+metro+cubico+equivale+a+quantos+metros+quadrados+de+concretoPDF 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_off0000e502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE502 10936 bytes
SHA-256: 962f9ce8df5319f2ae83ff2e0583903dcb0c69348bf0aa83a3bee5cbf6777ccd
font_01_sfnt_off0000fe27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11639 18768 bytes
SHA-256: a96278633f340b8157b41e14204cb06de95f3c6522647dd2ec0d445535b3c9a2

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