Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c720e8fc3853d0d…

MALICIOUS

PDF

91.3 KB Created: 2021-06-27 05:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d18ee234000ecb7fa9dddb10bd68ddc9 SHA-1: 7a4e6d1a094b3695c05166cd55cd3bea053f9b21 SHA-256: 7c720e8fc3853d0de90a98ab366db43f042f9de9ed57c211e3f343b29dcd4c26
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics indicate an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/389e1c71d88a5b5aecc77ca65edaa162/luxeluvevidenulo.pdf In PDF document text
    • http://karpatskiles.ru/store/files/76965779059.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/dogepiv.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/8pdq16g7hcfck19b59u4r1ck0b/74828510809.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/28788095842.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/liwadag.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/l7piu3nqr5v8vjd5qlfgnb3slj/jelaxaxixudofenasosuf.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/73862770667.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884010ea165---4692306835.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608104526957e---waxepewofibosirigir.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/j0q26p5oi3ge4f1mtvhc8pjohe/nogixitewodebidikivasof.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/7807938fab015199674dee2e5778493d/98222798260.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20216262034305006.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/500d69f579a89cc54e9d633172c61424/kafexuwodetaz.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc3bcdd990---bapamejevosezikerodaja.pdfIn PDF document text
    • http://446888.top/userfiles/file/fujoputudabejodagelow.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d1140bdca---49566480435.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824459cf297---38164781362.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/04e99e3bd8ae52cd3e3304072f1b8b48/panisowu.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b326e396079---pewofaxugapoxurinodupowo.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/rezivulolixigowuxatulugu.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/70883009736.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/22390960048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=long+haired+standard+dachshund+for+salePDF 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_off0000fc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC91 10812 bytes
SHA-256: d7930ddf5ead2945dcadc060a14d8994ba35c2436afe5a9a15c2bc667b9ec008
font_01_sfnt_off00011542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11542 18312 bytes
SHA-256: d61e1974512c7dbf914a4838bbadd56e464ddaf2361cd652a3e79b3f9e68ab38
font_02_sfnt_off000145e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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