Malicious PDF — malware analysis report

Static analysis result for SHA-256 d705620927955803…

MALICIOUS

PDF

88.6 KB Created: 2021-07-29 18:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 75cb9387e64d2d33227d44fbba535d3c SHA-1: a1f3721c62a1382bf4d4ca700fce0034b7ef52ca SHA-256: d70562092795580325ef4595543e015367f1aaf7a38b642d718b80ae828f2ea6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, appears to be generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the idea that the document is a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/jejuxefexofusaz.pdf In PDF document text
    • https://colakcivi.com/userfiles/file/80985481593.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/87f56ad3d1dab3929cedc85e82676007/29545092336.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/34179750452.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/42734485346.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a704a1d4a78---gawokutisag.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/bezezunowujulugenusipibe.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/gajul.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/11d87ccd8b7448fb7479633fc6b3354d/18297945540.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf8f862228---veresofawipodixusuripem.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608789cdee322---xufuwumino.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d35b532a4d83b2dd0f13d83ac952b6df/wuvupawaxefubegawenon.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/furizorefipotozo.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/wobegitenupinijozafet.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/dirakorewiwoxoxapamote.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9804ccdcbf---71811459050.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/jowiniru.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/83059917201.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/cd9b7c4c4919039acb6c63620b5e6595/63324441745.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609050a9ebe9e---157134184.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5800115cca---75050235678.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/p5gklpit87etl3da4a35p93vuc/15669838338.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/nigubaxaxafifafezujevapew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sample+business+plan+for+car+wash+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/wobosilo.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_off0000f560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF560 11188 bytes
SHA-256: 2f6e4c785e4ff3fbb3710607db7d056fee897088f0d34b84cecce330ba23d554
font_01_sfnt_off00010f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F19 16744 bytes
SHA-256: 3545b54d27315b179a9f2c985f7a80cd8efd6c9580768fb64eed9bff0626a1b4
font_02_sfnt_off00013a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1