Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3e4eb763421a0d…

MALICIOUS

PDF

83.7 KB Created: 2021-08-15 16:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e7702a80cd5d9eab949b95e2e985a98d SHA-1: 6a4c3e329fce1e959bc86591c4a4f48d90ab650d SHA-256: 7b3e4eb763421a0dc5d3ea53c0b59431f3c1486515b51236946dedd2fa64424e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious destinations. The PDF structure and embedded links strongly indicate a phishing attack pattern.

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 https://irlanc.ru/uplcv?utm_term=que+significa+plantilla+en+informatica PDF link annotation
    • http://vyveva.eu/UserFiles/File/55263154067.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/95e8b7b21aea392146f13bd8f25593ba/kinogekigumitup.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/ef53a9ff9eed0fb6c0a19a3969f6907d/befesisakovupoku.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f3cc2db15---ligixuwisezej.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc75d6711d7---25327059012.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/he0v0k5053v0ah25todpt4lbl4/mokilewewilox.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/12272033158.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/japoxogogasalejin.pdfIn PDF document text
    • http://benly-carson.com/product/files/10467762865.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/7468178785.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/busasul.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/9103839742.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/pepimotutabinej.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/dupafukafotonupokumaja.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/mixaluwefugi.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/zukuvedokoxugilinedaneba.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210719030852.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160889daa0f949---fitopapof.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a889c99684c---zivujemoxibezolemokazi.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8f13271f---78426865901.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb30e6e18d---15405832996.pdfIn PDF document text
    • http://industrialdevices.in/uploads/nokixomupolekuxe.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/xikokazodanibulewe.pdfIn PDF document text
    • 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_off0000e104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91B 10984 bytes
SHA-256: 567db4305678a0f3a9257d98dc0474453aa08add4682d2a0071222e87564e38b
font_02_sfnt_off000112b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B5 18028 bytes
SHA-256: d8e8a3f18c8f3c4daeca5eb0f89574deb11b4f312e4638707abd1cbda17f1a9b

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