Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f89ec353dfe60f…

MALICIOUS

PDF

80.3 KB Created: 2021-09-03 15:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 34cb1fb74b4a182b2e9800dba10c8a1c SHA-1: 9c828d3ae3afee0a90d10ccf095f2b6242cc9c9e SHA-256: c6f89ec353dfe60f001bada926b4f59bb10209dea98783d4fb7cda75f9740a9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/68e33de63a8f92ca32c02f41cbcea73c/gakis.pdf In PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c15bad4252---78213001700.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612d69c6dfa9b---60729585463.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/0015f0eca82cd9f5c058fc6ea4f77e7c/7751465969.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/wokekuwedagabal.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/eao94pg30437bqrdafpmbshi82/sunafodajisijukepup.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/83765274521.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/fiwufeseravajijovaposas.pdfIn PDF document text
    • http://apvn.info/userfiles/file/puxotomixigugijiw.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/38450984882.pdfIn PDF document text
    • https://crpm.ch/ck/ckfinder/userfiles/files/10383330670.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ec669512825fd113c7e9d59c6c78c7b8/mobugipurusu.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086126869750---89543276981.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/waxugimizaliteloralusip.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/683abecdfa6bb121d8cc160dec0edc6a/18919452560.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/15748872357.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608399e1c4cb0---voribafijibaxorumigaj.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/4691299548.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/20274935697.pdfIn PDF document text
    • http://liyangah.com/Upload/file/vasoribivagifugezonaredir.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee3ef6bc34---89249151750.pdfIn PDF document text
    • https://agrando.cz/files/file/28084676526.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/28186923378.pdfIn PDF document text
    • https://bloomeng.com/uploads/daletudatuzabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=jackson+hole+hiking+map+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_off0000d6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 16920 bytes
SHA-256: 44a914463679c2f29814faa213dc29bae7c4a1e419dba93efbd8524808a349c2
font_02_sfnt_off00011a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A86 10952 bytes
SHA-256: dd83923f1d963161639e0ad9b7a5a639aa0c3a29ee68a4d315c7bce67c0af79b

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