Malicious PDF — malware analysis report

Static analysis result for SHA-256 a722d2d9cab23e4b…

MALICIOUS

PDF

95.6 KB Created: 2021-09-06 11:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8024aa04c1a9e6b0a3d6c5be8e76b08c SHA-1: 998f8fba9544740ba316f983c5ba87f93549658d SHA-256: a722d2d9cab23e4bc5d79b77e6c04cc8a4c6c1ec183ff92caec0e66c4f5abe9b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with several heuristics indicating it functions as a link farm hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://waelfawzy.com/userfiles/file/ In PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/folam.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/dcd35a5743623e95f6ea75c56cb0f496/37822806642.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/cjj3mg7nmspqipvo4v5cc0ecp0/13840100543.pdfIn PDF document text
    • http://bio86.fr/fichiers/53255618296.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609480ec3ee05---nukuxur.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/28987670641.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/bowoxefutozamovanaxirakim.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/46594949762.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/9115292142.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/disiwemetixet.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/latetupakuvu.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c4ccbe55e3d2901c0184dd132ca27caa/40870236321.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/1f3c869d07ff6708044a1c2640456260/37312708816.pdfIn PDF document text
    • http://hk-keber.de/images/file/ririzo.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/162033121276.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912c5f06ae2---24938203461.pdfIn PDF document text
    • http://apsons.eu/files/file/sulixajobedufoxa.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/98516787206.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/4835465066.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd48176cd2---6959014077.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/nabilavotexisitikib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=c%23+manualresetevent+waitone+resetPDF 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_off00010711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10711 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F23 24996 bytes
SHA-256: b068af8bdd17decbb6113bfd066420e258bd75dbc40e5eef6a4782cec6597d0e
font_02_sfnt_off00015f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F3B 9104 bytes
SHA-256: fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804