Malicious PDF — malware analysis report

Static analysis result for SHA-256 29ac02c0311ec0f8…

MALICIOUS

PDF

124.0 KB Created: 2021-06-19 11:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 3fd2faa316942a752fc454ce1fe0f019 SHA-1: d3174a163b4851acc40cf56003dd9b44e1def237 SHA-256: 29ac02c0311ec0f8df3219018bda326d1179b143f022d2788b88c2e7d54972ba
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to redirect users. The PDF's structure and the presence of multiple external URIs suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb86ab03a11---siludofogagirezib.pdf In PDF document text
    • http://studiodabo.eu/userfiles/files/77796021419.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/015db55b2ba9c5e7c16d08d9096d0af2/86154607829.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/65945505009.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5300c0887---samevegufazupufoverarojab.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/disuxusetekasi.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ea8n6e4lrtqjbbkvtniqotied4/61379938981.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/iold7bpdmgpmqgg4s0cg9kj39n/vofajajedijuxaveritajano.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/tagotetijugubezod.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/7cc24fdf28cb29e4805879f4dd47766c/xabojazirubawuxejoforazid.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/58816603201.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d180cab9a8fbfa9b06ea04bc49f63e80/xulasowu.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36ef1d00ba---volalev.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/vawojazabovoninul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hunter+call+of+the+wild+european+bisonPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F90 6248 bytes
SHA-256: 0e80710ba2fdc8250c8492274af70d6ef726d8f9c6cd49d2938a0ea230957f80
font_01_sfnt_off0001854a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1854A 5436 bytes
SHA-256: 5f23970b55b285040434e9885b68b266aa1c935d590700a9257700f4df6a78e5
font_02_sfnt_off000197c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197C1 1716 bytes
SHA-256: 70b844f74996fcee5e1d27ce90af7085dab18ef8498285b96f5f41c426451930
font_03_sfnt_off0001a067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A067 13336 bytes
SHA-256: 3b86cef969b7c5cbf23d6a469c9de7dc72e3b39cb6f4c35accc63194847658c9
font_04_sfnt_off0001cbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBB8 16280 bytes
SHA-256: de050a1b3a4129b5cf3325da91c9a1ce733fbd5ba1b18dad4b177a0c3dcda825

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