Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0545a104ccaf3e2…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 13:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e70aa634fcd2cbe6b9d5ad1dba0a4abb SHA-1: bb6a4edd2a95be00cd8f91e14b2394cd527b8a53 SHA-256: d0545a104ccaf3e2306b4db80144a675188563234a6bb22d59fcb8c6e5f68832
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and other disposable hosting sites. These links likely serve as a distribution mechanism for phishing or malware, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mobydick-band.de/fckdata/file/xizufusev.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/640e74df0cfa05dd69d809d45c67308f/nirinuron.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/5b33908d25d773666fe0b2aba819025b/rinexa.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/misov.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/jiligawadapatiji.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821ab686ac5---gumivuxuvojez.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/41942791727.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/direk.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/mipojavi.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/p88185o14vr64112819ia26en7/votapironibuv.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/85937901587.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/wevedegumunalafepaze.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086edea274c0---91890638703.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/54430396852.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094482578a5b---tugafawajojelamapege.pdfIn PDF document text
    • http://bscartridge.com/pic/vipifibadibe.pdfIn PDF document text
    • https://ebooksweb.net/files/file/93377400341.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/a3028ca4d9c1991061ccd6ae5235ab4f/5865104093.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/9jaqas3kug85p14e1fvf69uhsu/45248688131.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/rowikozubunujapa.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/43020264844.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/lofovugu.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/23281937326.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/27339093215.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/vuwemige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=best+love+novels+in+tamil+pdfPDF 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_off0000ccaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAF 10680 bytes
SHA-256: c42c7d8729dd5368bbb5713812a97f400d18ba1cae2b1a990befcf6e9e10fe3a
font_01_sfnt_off0000e537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE537 21088 bytes
SHA-256: c182932c6cd914def3c9af72fa874d32a6f6ed191587a8321320bfb58ab79be8
font_02_sfnt_off00011a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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