Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a8decbdee4403c…

MALICIOUS

PDF

103.1 KB Created: 2021-06-27 07:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: dbd536e45c0e9620b5842c45116ca9e3 SHA-1: fb8e7ee4fcf29903bc0da7fda7c248a20b9bd27b SHA-256: 21a8decbdee4403c3291a424311bae1d7ddf4755fd7cd62f331fa870a1f1aa6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://applecentervn.com/uploads/image/files/63671711487.pdf In PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/purgasutkjq8b46us52brqdtjc/72545773345.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ccef25889d0---gulojiwamogezuwepuvimi.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca2c877c6c---3742797681.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827bc9778bb---moretinomaganiked.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/tbtqb5f2ht0n2rtocoslsvcf45/9995439372.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607db4f7adc07---7810040600.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/xozonupekunetapamobopo.pdfIn PDF document text
    • http://guchenes.com/d/files/wijijolologibuberibaro.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16075b516df720---93266874356.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210612235201.pdfIn PDF document text
    • http://euro-ex.com/zudilune.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/60758870709.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/worul.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b28db15c---mibakaturekezubuninumugix.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/95432790282.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/33718919457.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/xawimawemigizanerodobivis.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72ed2a5b04---82895634181.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/35805229728.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759ecb2fe75---71382970653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=guyton+and+hall+physiology+textbook+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_off00012b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000143a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A7 19592 bytes
SHA-256: 6de90113f42863ef9aa31add5d312591f9cea1fb3bb09e778998b393eb933aa3
font_02_sfnt_off0001751b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1751B 11264 bytes
SHA-256: 482b7113eab634230a47ad408e34f407e14bd5abc09c2eac2b5f4dbe144a7f07

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