Malicious PDF — malware analysis report

Static analysis result for SHA-256 5125a483b011beb5…

MALICIOUS

PDF

78.6 KB Created: 2021-09-13 11:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c8f5222187506baf27f9a686da45580d SHA-1: 436cfca1512058a7d619c8910f484fdd1b0967fd SHA-256: 5125a483b011beb5bc342c79dcefb3bab81a0b45d1605723ccddf47c815573c9
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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 http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f7645d833---11890391570.pdf In PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/neriwabudexakurobavud.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/japutukemes.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/10831077092.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/boraduwaduban.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/bexawofafozoxanobalo.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/zegiligovodawajaferivojo.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/50560867570.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/senusubijaxunogorenegekis.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/35429347656.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/pilabamanimo.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50844637200.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613258b62a342---doradewul.pdfIn PDF document text
    • https://tavio.ru/files/file/bugisabutuwidoxevetupalof.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/vopobotev.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/tadoleratevezagogero.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eae623e903---625885271.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613120b05885b---rututazuxuvoke.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/27503680568.pdfIn PDF document text
    • https://33mobility.net/uploads/files/welumomagodokuwuj.pdfIn PDF document text
    • http://suaups.net/userfiles/file/59915819096.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/dapotodubinobo.pdfIn PDF document text
    • http://guowangcable.com/d/files/mijoku.pdfIn PDF document text
    • http://rinsacars.com/files/others/xikiwedake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=chemical+composition+of+alcoholPDF 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_off0000d173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD173 10676 bytes
SHA-256: 5dfbe0bfd5cac3d36c86816bb8e776f5bafff7ee484f842b9c8cf9d2401fd8bf
font_01_sfnt_off0000e9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C4 16608 bytes
SHA-256: 505b055718d2d68e5b0f007fc2dd5d2531974cb8278e2948b5cef9efdf1f4875
font_02_sfnt_off00011460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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