Malicious PDF — malware analysis report

Static analysis result for SHA-256 752bc20f28f085bb…

MALICIOUS

PDF

230.6 KB Created: 2021-08-18 06:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49ec21808fe7b31497dd3c741ff432de SHA-1: 6ae25e88da9affe46040b2497665b5e6b8fed44a SHA-256: 752bc20f28f085bb764494e35b72e691fd6a4253af5876e4e55b0f28378bc638
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised WordPress upload storage and other external websites, suggesting a phishing or malware distribution scheme. The PDF structure itself does not contain readable content, but the presence of external links points to an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8757

Heuristics 5

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=how+to+tell+what+model+your+smith+and+wesson+revolver+is
    • http://hondatayho.vn/images/ckeditor/files/40537730129.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdbb2d5ff20---vuxezinepobuxesasogok.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/22c895841b9f39f155c623338977d81e/xewateworabiseniba.pdf
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/27687101474.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b83a405bc92---pesaxupuxuwesajivewomowes.pdf
    • http://www.siscbolivia.com/admin/uploaded/fck/file/36526805622.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0158a985e54900c083e9761c6c59ca55/74893438509.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/82be9405fb12285bb9d1baeed4f6e28a/givinexinuwozumu.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/0b31a00337cfac8202ee60103962ef9d/jodapabafowevivinugowifis.pdf
    • http://vitanova-cattery.com/upload/file/negabofovuxit.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd71564b1eb---29820081333.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c585ef25e---kujevuwalugumibusajimo.pdf
    • http://www.alcera.ca/userfiles/file/84547158482.pdf
    • http://jtour.vn/userfiles/file/89501922199.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa365cec755---36606033926.pdf
    • http://angarakshaksecurity.com/userfiles/file/lozetevazidonut.pdf
    • http://csc-0411.com/userfiles/file/20210630082257_ss68sv.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/cfc0bce096184a6060b0edde5e01f88c/4571290546.pdf
    • https://prevodi-plovdiv.com/userfiles/file/sedatapugunegikiga.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842d26b9ed9---taziwewodixujuviloranem.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c042784c497---momikaronotewejux.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771ea273643---50340172391.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160758714807b1---sasasuwesa.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607071739dc74---sivuzevakevimojafem.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000328bd.bin
8c2c2de1c4783560ed083d2db1934cadfea492da1f475d0047e9fad8ebe1a84b
pdf-font-stream PDF embedded font (sfnt) at offset 0x328BD 18400 bytes
font_01_sfnt_off000359d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x359D7 16792 bytes
font_02_sfnt_off000371ee.bin
f072716ebd7bb550e04c3ed04a93eb0432eb915e78d7b3278351694874b06f8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x371EE 10868 bytes