Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3d0d1d2593714d…

MALICIOUS

PDF

86.1 KB Created: 2021-08-07 12:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ceab4099b1d3b2d86710b49684682a9 SHA-1: 92993447b2b0729b4e3bf9fe328015f3f2889df1 SHA-256: 0a3d0d1d2593714d8f3a2b3af708bca826937c56a767de26940c4574352adb87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://fcksa.com/ckfinder/userfiles/files/33284097735.pdf In PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/wivolududa.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81543121f7---tizubuwugiduradom.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/beripijusegakesukulika.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd786e2d1c4---1947550408.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/5ceab876cdc2823ffa076233b813ac85/nakim.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/zojutipulorarutijipesovu.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3cf73220d---1872269097.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/rokilonibobupa.pdfIn PDF document text
    • http://sam-global.info/files/file/56046925769.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609c82ec4e6f9---lusumufidedajureretegavi.pdfIn PDF document text
    • http://stillwaterponies83.com/clients/74660/File/xinonoviwag.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/62619912371.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210522152145.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/fbdc5edb2c636f00e4e2a72d9149da02/fademivoromo.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/wuwewisiburenuzu.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608df16da3227---sujiwajopoxuz.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/sufubujujikaruniziwuv.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/32731339599.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/zuxipabixagijofux.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/pezupironerigapusomar.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/xozesenuzibogalatedew.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210619042411_mizxv7.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/edffcd45303f59f4d61446a3ad6e1255/61226075072.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbed1f02d4---pekisalijurezudaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=can+i+write+off+tuition+as+a+business+expensePDF 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_off0000ed48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 17156 bytes
SHA-256: e1037a9c761f5d1e823e9390a1244527304242128a87c5e8e9b75a753a6657f9
font_01_sfnt_off0001198d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198D 10764 bytes
SHA-256: 4aab3eef9c7a744d62a24f7e7ad64c796fb687037024f3d4f8154e77920a72fc
font_02_sfnt_off0001326a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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