Malicious PDF — malware analysis report

Static analysis result for SHA-256 20028b65f778e29f…

MALICIOUS

PDF

89.7 KB Created: 2021-09-07 03:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7d6bec76972e8ef7349751ded9d08f48 SHA-1: e978d33e0f7448d82e1fb783a938d0647c40c2be SHA-256: 20028b65f778e29f2057ab647a73c00fbf797f4885a5ec682322542eb6d5e592
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF containing numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://anthonygillant.com/userfiles/file/4435815939.pdf In PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/51078708513.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7b0bc2b81---zijupuvoradas.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/49622504170.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/82433664195.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160993c60d01c4---4313578195.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7bed66ce6---tirebokomesivezi.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/videmikotawufunapo.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607243f9d84a6---88812557607.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/vuzotajodovojopek.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/85smkhkohb09257mjlpu4adcc1/89270804269.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/61a9342bd17aec0e6690153c3c1bbc10/2225216985.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec70c2dc88---gulojerixemifo.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/88228933022.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/mogelivemowulat.pdfIn PDF document text
    • https://egf.tw/test2/images/file/pesajaf.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/02f1d211662e3e5779a2bf84b5168ee4/29521862124.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/0fe79be9c677207504fb751bcda12346/41060042630.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/74134833479.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/089dd67b35de5ab8695bf90e7f572f3c/wikomoxowumipuwekodese.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/taxamaturevepazud.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/vadamuputipoxobaxubijav.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/wuzubigapamagepuzu.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/zamer.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/zewonozixep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=nidia+diaz+nunca+estuve+sola+pdfPDF 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_off0000f678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 19244 bytes
SHA-256: 7f505d246e4e6ac1e65dd09216d6c841fd9aee1180897bac533759e778bbcbfc
font_01_sfnt_off000127b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B7 10716 bytes
SHA-256: 46a902718a7f1008e31318b03a7fec12a0b1a70905b107dc72685af55d436cd0
font_02_sfnt_off00014082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1