Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa08c09adfc5347d…

MALICIOUS

PDF

96.1 KB Created: 2021-07-24 16:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c08f3a839237a76f2d75efb551567cf2 SHA-1: 6915a5478e43854c741d866f002bd5e4bc47594a SHA-256: aa08c09adfc5347dce848498fed949b144e0d1029a478dd44f5eff9584e39348
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on disposable domains and compromised CMS uploads, a common tactic for distributing malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method used to evade gateway scanning. While no scripts were directly extracted, the PDF structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://21cedu.com/pds/userfiles/files/43649845830.pdf In PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2ab77e5bc0---nidimat.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee5766732a---46603010087.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/d7d820a0e9d381966efcaf917e8432fa/kevogoxufo.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f5bb5f67ffe38fb6754ba4ef4d1ddb91/sokopelenalinimiwox.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/2ecb53d69783b1c6dc1b097c0dcacaae/wafoxolasatal.pdfIn PDF document text
    • https://digicpictures.com/downloads/levipazidatoso.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210723_811FE247BC73B7BD.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/17441891190.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609032b6c4b04---niniponaxijapevamixu.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2f637fc45---wasolaxilobusivame.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/rakigazoxewigudo.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/jeselalifuwafiguxu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9e00ae3770fec1332c6b6976ae84bd85/20669501923.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/19639620628.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7d7a799d3---bolaluk.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bomanesulugosuvad.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/fec24335180a60a5a89accbde520de34/tetidobaso.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/tibef.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d2a48ca0---94892997521.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/35511413724.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e54077ebb3c---20551267353.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/79244735327.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/55764715686.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/0bac7e5ac5114c378ec4500fce59b0fa/13402467919.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/juximojagozikigugezus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=download+firmware+samsung+note+4+sm-n910c+indonesia+google+drivePDF 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_off00010e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12666 18180 bytes
SHA-256: 4aa51ba90b1a7ade5a503fe2dc3301c1ba9bee80feee4f7466f79038880046d5
font_02_sfnt_off00015636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15636 11524 bytes
SHA-256: eebd7ae7b432d6be5a7a75c99b6efee34b277d3868374d7a3ccc2c7dfba59362

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