Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3bdf08f87da56fe…

MALICIOUS

PDF

72.2 KB Created: 2021-09-29 09:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2ac8341320ffd9d4fc782ec20121e5f3 SHA-1: 0a46ecc43f80755c7f498e3ae5b8b54309e6e334 SHA-256: a3bdf08f87da56fe99b93176e44a5ce915948bb2d9194e63aa4a2a1f2f8abcb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure itself is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://uts.edu.co/portal/app/ckfinder/userfiles/files/61406775316.pdf In PDF document text
    • https://servauto.fr/img/user/file/zizoliwevufenaliwufi.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/gijopejumumife.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/69145155419.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/nebazegakonuj.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210925_1A5470F6DCBC54C3.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/34987041771.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/zuvuzusowizemif.pdfIn PDF document text
    • https://websbag.com/uploads/files/poludimedomuro.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364a2d767c5---58302511667.pdfIn PDF document text
    • http://teraval.cz/res/file/20474730532.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210917164644.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/96243613960.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/9935729053.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/21580322105.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/88893e97c06cbcf59ce2b203ceed3e03/59724831845.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/23902966972.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/tufovigif.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/22010543986.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/98212565219.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c1f844503---vojojekabudiwizololimuna.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/pixugel.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/da4d79149b37aade5f93819c35a7ddbf/95923512141.pdfIn PDF document text
    • https://dulichsamson.co/admin/webroot/upload/image/files/12957225273.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/xelevezuretubexozofivero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=3d+sexvilla+androidPDF 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_off0000b844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB844 10388 bytes
SHA-256: 8c94f0b3af5d57e55d86d41173b1a467d6d371e4d6ce82ee76cea9e39bfdc9bb
font_01_sfnt_off0000cfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDC 16928 bytes
SHA-256: 87e4c466d357f54c7ee69ac6df4d2b1c7127c6dbee7329dfc572ce995c9fa275
font_02_sfnt_off0000fb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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