Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe57980be7ecefd7…

MALICIOUS

PDF

80.0 KB Created: 2021-09-02 04:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6a378ad722d335a27ac5f6ab5d624e9d SHA-1: c49c6f129391f2022c0ecf02e35e1566a73f0458 SHA-256: fe57980be7ecefd70dcfec79e09f5eb77954b87f0f6340de811bf5f2741208e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm for malicious purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=chess+5+move+checkmate PDF link annotation
    • https://irantruck.ir/data/file/68270231541.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff91a19753---xujirafuvifugumaf.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/patanotatimijavijetawipij.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/418662d66c765ac8646bc6c1b3498a53/86375870352.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/4glk7kdoh994e36aloog3u4p7v/wijonolimurata.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/bce6bfeb4053377284f40c237792bc00/7178697331.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/vejekojomavarem.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074169b2c44d---9940766843.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/bisosukuni.pdfIn PDF document text
    • https://akvaguru.hu/user/file/26049331897.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/q2n9039453r65p1r7c0g9qmggg/lodininilapupajibeg.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/7979696655.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/41593026122.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/pebavob.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/6c1c0e108f3fc5771a28d692982cc6fd/31169873577.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/jenh8a2f7uh9m1487laqumchsl/45213653289.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/viladewinebalorixavaka.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/vkutlu2nkcahjr3gteddgtdld7/jajadisijeg.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/womafofi.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16115bfdd73bfa---22621489184.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcbc2659f38---fawarikexeselafogosuxaxa.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/43725694476.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/tarojivekuzapomitigidu.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082f9b17e582---jivuwuwenejanowoxo.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085296a67c80---zalutox.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/70671930945.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/38737463989.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/mexolabegiwenewejavawi.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_off0000d6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 16508 bytes
SHA-256: 1a76ddf8a0f9506a00d35c297683a11920450372e1ee6bcd569068829d0908f0
font_02_sfnt_off0001194c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194C 10476 bytes
SHA-256: 61c82eebbc8ccaf719161f3bcb80e14697b2875992367f95aec616ea6eaf22a9

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