Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd75b77a3ea457f…

MALICIOUS

PDF

96.2 KB Created: 2021-07-06 09:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ff846d8758e55e6375623be0e1ac5614 SHA-1: f169da034b08c9cd89df0c865ad3d8f6465dacb7 SHA-256: 8bd75b77a3ea457fc83c142b9a980e3e32f4e40ae2ac6080ef8d20ea4e5e55b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms and disposable domains, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links. No scripts were extracted, but the structure and URL patterns are common for malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://cructi.ru/uplcv?utm_term=complimentary+words+starting+with+a PDF link annotation
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6cef381ac---nibalabobobepasijo.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/7eqb0fc3bg49v99dlunfgjv278/94235703929.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/4169018056.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/58173639232.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/1fe03903177449f29a2f050840d3be92/lizilusuzolofuxud.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/6b4bd47919ee0ab6fe4afa227d50f219/veruroti.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/xododuvilinowabikexudid.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/7eqcfhi9sbgnn3dtti13i2otpf/18252785369.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/472267758.pdfIn PDF document text
    • https://susta.vn/userfiles/file/favifiwexosuzeman.pdfIn PDF document text
    • http://orrizon.ru/images/file/36533088711.pdfIn PDF document text
    • http://markone-tools.com/upload/files/12921779048.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de91e4d1a3---vifuxerofamux.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/16453147555.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14bb203088---63295176004.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c6650d060---32714614119.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/22114390483.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/47519957568.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/65722615839.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/67361902248.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc57025800---wikovijaru.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/i59mdlkk55bi7lodo41d7lpj03/31173860069.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/3c87n30hjim87e0euuh8h90vvl/39532155758.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m64kt5k6j51vkfu7jtdc1sr1s6/23886674027.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/gelazetotoruwezelipelawa.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/1366220557.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_off0001178e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178E 11068 bytes
SHA-256: 28234affac734432ac889ea1efd80754d6bdeb8e8efe30f0f48d8db61513214e
font_01_sfnt_off000130fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FB 16476 bytes
SHA-256: 2617a92cd55826efd2825e3dbfe51d276b9854a47120cb32a36330cc7788b03e
font_02_sfnt_off00015b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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