Malicious PDF — malware analysis report

Static analysis result for SHA-256 031fdfacd611c6cd…

MALICIOUS

PDF

76.4 KB Created: 2021-09-06 23:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd43c6c50e0f5c85f512ca7a7f3ef0d7 SHA-1: 32d6f0a5b3128cec057ad0be45e1c28a31e7cfde SHA-256: 031fdfacd611c6cd8facf618c38b38ec454373ae7f03db3d8d2ef1f97d1b9d02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of external URI indicators strongly suggest it is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pistant.ru/uplcv?utm_term=constant+of+proportionality+worksheet+math+7+answer+key
    • http://allprintusa.com/admin/images/file/6502521994.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094136740153---belekererokufazapadilawat.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8c4900881---jowusewa.pdf
    • http://patronusalapitvany.hu/public_html/upload/87065760686.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/je3kr9ln4gt1l9en4g70b1jb6e/81979694743.pdf
    • http://royalrep.com/userfiles/files/fupiti.pdf
    • https://swagath.co/new/ckfinder/userfiles/files/medepaxominawazawopo.pdf
    • https://binarbaidequipment.com/public_html/userfiles/file/21053866825.pdf
    • http://agendatourvietnam.com/hinhanh/file/vesojugadozadavivadabu.pdf
    • https://fenixfalt.com/userfiles/file/385940619.pdf
    • http://rebeccafantarchitetto.it/userfiles/files/gofesavijatozigupikovan.pdf
    • http://babyshelter.net/assets/upload/files/65939025488.pdf
    • http://vansuloi.com/uploads/userfiles/file/85624473484.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/9596c0ceac14ced565b6fe09dbb9954d/67637896896.pdf
    • http://hyswimpool.com/userfiles/lidarenimogezebazalasid.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607832bcccfb3---21316165273.pdf
    • http://adabaskimerkezi.com/upload/file/funevixawugoxid.pdf
    • http://pscemetery.com/userfiles/file/72412196076.pdf
    • https://jechrina.gr/FCKeditor/userimages/file/fipenejo.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160924fdfbe1ac---85547076982.pdf
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/35414763251.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0c821a8ff---duwebujala.pdf
    • http://omegapizza.net/uploads/files/kodorapikox.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c55a.bin
5653d9b2af7a54375b326e93695ab1201797555abdc80b0522ee759da9dbd1fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xC55A 17260 bytes
font_01_sfnt_off0000f208.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF208 16792 bytes
font_02_sfnt_off00010a1f.bin
6068239c739a45080605ccd64953da30a28e24b282858205d7254e8cd851ea0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1F 10996 bytes