Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f4567fe8fe9d79…

MALICIOUS

PDF

86.6 KB Created: 2021-08-04 04:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2c75353b87ecdbd1d62a188fed466394 SHA-1: 65a1e3fa5d3f4028f80f633b66839f639e2c50e1 SHA-256: f7f4567fe8fe9d79f1b790e2480edf22e0cbacbbc28a9f46ca9288ec99f812c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns are consistent with a link farm designed to evade simple detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://archism.ru/uplcv?utm_term=9.s%C4%B1n%C4%B1f+edebiyat+soru+bankas%C4%B1+indir PDF link annotation
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608008ed813ec---tapesota.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/76765992289.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a249d92813d---joriziminisuvubefuzojux.pdfIn PDF document text
    • http://palami.by/images/file/kakutuvinekexaxis.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/39666994890.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b324374fc---zibobowexo.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/neqrurdq69nivftrf6o629mbv4/35926846189.pdfIn PDF document text
    • http://asfalon.com/__files/file/xovik.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/78085d753097f45cc82a664756db27d9/wixikojisiba.pdfIn PDF document text
    • https://agrolliance.ca/ckfinder/userfiles/files/pawefugogepulepetob.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/mowigeganiguv.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/wusaxafiba.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/22478770303.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/89055935488.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35d704d69f---dobaxej.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pephsqc2g52fsgp0fmlh1u83v7/wonatisosodobujubilo.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/11664183272.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/ganazifezi.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/34942849205.pdfIn PDF document text
    • http://cga82.com/admin/File/nadivanabi.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/jp7ikt7hvmp74hg7q6gq0oug2d/wiginabopexerazof.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2298f32c2d---54368991442.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/mipeditanewazepir.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/18116502118.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_off0000e9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F1 19160 bytes
SHA-256: 37293c497013ce8cc4dd2b6c8c002bf040967b9873a44647c87ae627ca91a398
font_01_sfnt_off00011820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11820 10928 bytes
SHA-256: bd86a146dbe42ccc89b3cd89cb4b6a7c2c5fffd97bbe71a1d8c420ecde4a6254
font_02_sfnt_off00013193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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