Malicious PDF — malware analysis report

Static analysis result for SHA-256 4514341cbf89b4e8…

MALICIOUS

PDF

84.6 KB Created: 2021-08-21 10:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4226ff107918ff544592e22e9c196a64 SHA-1: 35dceed66bd319b9fcb9c72b1d9e390bb583b9f6 SHA-256: 4514341cbf89b4e8df8ed4678a79425c33222bce5c1a132abba1deb1c9b29460
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a tactic of using disposable hosting and potentially SEO manipulation to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://likeevent.it/writable/public/userfiles/file/18319146474.pdf In PDF document text
    • https://loctra.net/userfiles/file/48460701087.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/49548385608.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/28944044139.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/87775785002.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/27fc0194eeec7085ba843b5fefc4bf75/32316006698.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a14c00fac4d525aa066c61f7f9ac7fc8/41320247947.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/49040877585.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/zagusoxidolijepes.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/bf34da625614a16a629e85a3465c6d49/tazubejuleja.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a62b3f68ff0---71025767572.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/22e5ee73215e6451fe77b52ea428f4c8/sifewubajaz.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/f3d2f1a028b8b0ac196fea7754d9bde5/detimexanusek.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/8f1b5ae818896e048cf84b74f458c185/97720441122.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/jamezisemupunupaz.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab614177c6d---93221079841.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/9391818651.pdfIn PDF document text
    • https://tonitomov.com/picture/file/50248475678.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8a864ea0d---97068870538.pdfIn PDF document text
    • https://limsurdua.com/contents//files/82008058975.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f169c5e30---jonobelusuwowaralotuwigez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=adobe+illustrator+cs6+portable+highly+compressed+free+downloadPDF 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_off0000db0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0A 11656 bytes
SHA-256: 8c04001f1b7ad2012efb90f40ac011277644f018192a047f392fc5be904743e5
font_01_sfnt_off0000f648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF648 23300 bytes
SHA-256: c459ec059f58ac145e5f2eefa50210f46ba93edcbd347d3561c78e1ede4053de
font_02_sfnt_off00012c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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