Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1120c46135f436…

MALICIOUS

PDF

88.8 KB Created: 2021-09-01 21:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 8d6059384d221d3118a2bfb4a58e351d SHA-1: dc3fb1f457008e5f51bbc21fec6cd45890b0612a SHA-256: 4f1120c46135f436efa28f4cfeca0b8b5dffc2c5088aad66af6307cfa53a630f
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=five+feet+apart+movie+with+english+subtitles PDF link annotation
    • http://www.knickmeier.net/images/pageimg/file/83147222422.pdfIn PDF document text
    • http://badgerhillfarm.uk/77162538795.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/e8f5ea0533aba3830a4e92ca98e2d265/sifibudaxisekudo.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/61817907755.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cdef7682ee5---99597355143.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b8e125152---fafawininafagutigabe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a373fa9dd82---45062360507.pdfIn PDF document text
    • https://webmenuplus.com/images/file/xemumasaliremefogitavam.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fdd19d46713---30735158968.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091f3ebc54c7---30389627094.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/40713418559.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/93460303615.pdfIn PDF document text
    • http://polkovnik.su/upload/file/darojogozita.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4404b60309---wugokewa.pdfIn PDF document text
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/83723692857.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/7omcmjaj7mac4ohjon0ablprj6/nemesapupemekuw.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/57907255137.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/akpv0k0c9k12o0ojhnhi70p3rt/53950579975.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/57011720572.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/21840919756.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/o3qh1rs97lc71g6fmhtf2pu85j/tojaketobakilovexopaxo.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/dd4c96c9002dda6f261d6bcd109aec8d/53246484772.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/59681259928.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/14188628235.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_off0000ef58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001076f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076F 11172 bytes
SHA-256: b59bc445a78c1bbfb8e8f888c3d01be86e78d4093469e66a64f0409b2e432eed
font_02_sfnt_off00012133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12133 19288 bytes
SHA-256: b56bbcad7ad0a7523bed63410781b8f03936429b115d2ca185b68fb2a4a4ad0f

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