Malicious PDF — malware analysis report

Static analysis result for SHA-256 44977faeab5fbe1e…

MALICIOUS

PDF

83.0 KB Created: 2021-06-15 13:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8fa0be87a44877b73e85c97f910d9f8d SHA-1: cc5ea2250d35bab87d425ce934038c10d20e13b2 SHA-256: 44977faeab5fbe1e406c84f8930da161f9d455eb98ba9fe466b62c19325fdb12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised WordPress sites, likely serving as a lure for users to download unwanted software, as suggested by the URL containing 'volume_booster_pro_mod_apk'. No scripts were extracted, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nomylo.ru/uplcv?utm_term=volume+booster+pro+mod+apk PDF link annotation
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b5a943747---88568730338.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/9684db7a9383b8ce9d7f2806075621ec/kamepij.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609044a4701e2---segip.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/pebugobasizivanadenaz.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/fusogepolutuxuduxepeji.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/c8c99a59a1deab9ac5286c7d3b9a39a7/mamadaneri.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/0a39cef6e7713f38f9bc913ae0aae71e/23458301556.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f448df2a02---daxiruv.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/940e1f670df0a3b3a233fd83bdf6d28f/tegewovabijazasujiz.pdfIn PDF document text
    • http://aimic.com/userfiles/file/fusimesatupogiw.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be001a655ac---kagawowagogotetuvupi.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/98d625d6fabeecaafbcd26dcfabd829c/4269888773.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/ijrd70m8h5c8ahir373fli7va7/46341541108.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798efda97c8---94087759027.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/84664329064.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A9 5272 bytes
SHA-256: 9d51eda524e6123fce3d3dad2188d61bae7c46233680a23d84d6f3e6193d3bd7
font_01_sfnt_off0000f273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF273 4344 bytes
SHA-256: f1e52bd9da2e4678d307a0c7ffbfb39c1aff102c37e9e4b1051ad5cbcea62299
font_02_sfnt_off000100c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C0 11512 bytes
SHA-256: 1cc053ddf529ff05a019aa0751562451927732459769f87cda553487a785e72c
font_03_sfnt_off00012845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12845 16448 bytes
SHA-256: b9502a84d68f41bac1ac10ecb2b4107f44d2b2f0727e0ce1289bb1b053bd5d13

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