Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f5225bffafcb47…

MALICIOUS

PDF

75.5 KB Created: 2021-09-05 01:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7b2b71050b203d37a019b40fc835e856 SHA-1: 0e6d76e9d2a90863e6a21ab1c8359b7682b1e2fd SHA-256: 43f5225bffafcb479a793bbd185be704983ed56c483a81140e917be6f5cfd93d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, identified by heuristics such as 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to these compromised sites, which likely serve as landing pages for phishing attacks or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://study-go.info/wp-content/plugins/super-forms/uploads/php/files/20b4a53f1ed4dea29de22d5b9186a3dc/tutunosajefetajolawatolak.pdf In PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d3a7e22bd---bojerewaveriwovo.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/0ee1c24703837d7b09115a487469aa63/56516019503.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e036e88f42---bikutatuwikibixofimuzin.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210519175842.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e66520b7f7---gamojoditidojube.pdfIn PDF document text
    • https://brs.jo/userfiles/files/nudefilexofatosa.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1d452a915---33003384615.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/97685543403.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e57445e35---82871852447.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/kenufagan.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/musifonawunofusajimi.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/6o015b51r269j2gp61leadjvej/45505532275.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/5807c103cda5d130abd8022ccb6bcf72/bulatipadebojitipasezig.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d350a67b6a---fubevudivibet.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/movuvixigekefewugisovew.pdfIn PDF document text
    • http://hncastlecable.com/d/files/34399403853.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/41427202859.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/1c0687681a1aa598099c84c49d3b2540/5490362000.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/k86t45fk2sui9jj59kulb0tpas/zakijawivurukojegugorewa.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/18126935217.pdfIn PDF document text
    • http://riversedgefm.com/files/file/duzoxonon.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/xajetinodi.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/votezupuji.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/0cp5an69c6gni09c2hnu275mu2/gupevowetojixizez.pdfIn PDF document text
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/mobaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=intergroup+conflict+and+cooperation+the+robbers+cave+experiment+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_off0000c56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56A 15468 bytes
SHA-256: 7ea09fc83468661851efe92acbbf5815bb437753b82a94b8e2612da57914f30a
font_01_sfnt_off0000ecc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DB 11424 bytes
SHA-256: e3df33850efa387ba97b0cf712288b6ccf7ec2f12b377a2136998a823a0ab3a3

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