Malicious PDF — malware analysis report

Static analysis result for SHA-256 f245bca93af6cf47…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 12:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f562d062febb67ff90d066e00d43e5f1 SHA-1: 430fbc5f05382f2da820d10750080a9031672772 SHA-256: f245bca93af6cf47728179a68848bf0464d59bd8ed472e0870aaea69df865b29
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS uploads, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation. No scripts were extracted, but the structure and URLs are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://hasdeu.md/data/userfiles/files/setizude.pdf In PDF document text
    • http://cmuniontravel.com/userfiles/file/jabugukukevagakebafubewop.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/eb538329ac049e680d9c676b0c99e028/tojediretake.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/wuwidadulogur.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/39958952963.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/nedegiw.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/49448346188.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/wutufaxotixuxemunitil.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/begoxapewaxokevamebedow.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/34034059753.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/51980701411.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/3791177361.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/vubuvib.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/dobelitujomu.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/kotovumukovusawoweduma.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/pajixibagurexosezawizetop.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109021555531020.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614210df3038d---jalatukozugapuvelo.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/viwebimitezerajixu.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/243a09b179103e08d7333aa8d958c040/xaterifujuzoti.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/jofufunowuzowimal.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/bac30d232c6678140f363e4d7ff7505c/wunozetujiminu.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/88048304423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=autocad+viewer+androidPDF 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_off0000da47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA47 16660 bytes
SHA-256: 4a2fab21e21b5f315b9a53740fc84a38bdacb420a1ed0866f83a404968ae50a4
font_01_sfnt_off00010632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10632 10380 bytes
SHA-256: 187b9e27af2d88cde191cf9ba9acd97fa5dfa58927ef12789efe201c707ecb7e
font_02_sfnt_off00011de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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