Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed4ce5fb78816d0…

MALICIOUS

PDF

89.4 KB Created: 2021-07-23 15:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e1ffaab55996541f148db1a2bb72af3a SHA-1: 904e03f28dd33f450767a8debf6090dc49c934cf SHA-256: aed4ce5fb78816d0cb2087eef900d2b3b38e65f72ab7efd9743029a2e07cdae3
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document's structure and URL patterns align with techniques used to obscure malicious destinations and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://butchercurnow.com/img/shop//contents/tifonaf.pdf In PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608780c00c6db---ribakesirijalajixe.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/repigolobaboxogoke.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7d267be59---26129766605.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33f2345a2b---lotoneb.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca22b5a3f9---7231171317.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9b6db1f4e---tusuxegidokagedizu.pdfIn PDF document text
    • http://vhshf.de/File/sexapaxufo.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/52503346306.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098798be7ae4---63038146883.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/14326013096.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/75083704754.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa393ecb4f7---92384457877.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/tigilanufijikukiwap.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160907f82703de---46178338460.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160da217b9a611---lumivazikomox.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/92375158144.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/mekibubenabiwamufovuporo.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210605_084211.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/rexelemejokasepetoropuzid.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/zobofapivivolimizijop.pdfIn PDF document text
    • https://agatanorek.com/files/file/duxilegelafujujaluzu.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/nobixubev.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/794mbmqbo9l07akjpcf31uhqk8/13366816212.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/e270da2ee5169bd27aa9691284338d4b/93924685423.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16098da8e7c824---xofebakevonalabip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=can+apple+track+my+phone+with+imei+numberPDF 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_off0000f984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF984 16872 bytes
SHA-256: cec0b60b3ec29814e74f96f76d0a65bfbc0e5a7a7bc6b0541632e6f3387fbe24
font_01_sfnt_off000125cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CB 11036 bytes
SHA-256: 72ebff6b965d4f6d8a9ea1bcd89c273dff5b8138b0ce460445561102e72a7d30
font_02_sfnt_off00013f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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