Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a803cd02d2bd8a8…

MALICIOUS

PDF

81.3 KB Created: 2021-09-04 13:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cfe342f923b9fc945273601d99b8f0c5 SHA-1: 1705aca1b74a838ca44af66e40d8bb34855d2905 SHA-256: 8a803cd02d2bd8a8b1b112eb6414555fdb25b11e602635392e39ceacb583a453
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://krisoc.ru/uplcv?utm_term=disease+of+heart+pdf PDF link annotation
    • http://npi-management.com/ressource/site-image/files/86762889756.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/42284104220.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/fopanul.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acb8f99c37b---55650585392.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/57497667498.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/b3cfc6feb77376a2476c1d37ceb9de44/dunikemo.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/ludekefozemogeso.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/mujadekekuxivebibuli.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9f8608fe3---dasatidevujirituwos.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/11927163852.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/fukovexidinuripu.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/einutm8civklcp0b1ojamungu6/19539233179.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/tilolajavepavulafesuvugaf.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/74120257390.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/94462803929.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/linagiforiwojuxokupelugur.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/falawasadowobukal.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210902020634.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/wuzevetujizukofu.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/40427394848.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202108111911546746.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/fisomirakifinimax.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/puvimarubiz.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160749a0ddec38---xewofojupebalasovopesasoz.pdfIn PDF document text
    • http://tavio.su/files/file/rovunedanarokaso.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_off0000dbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 17132 bytes
SHA-256: 58b26d707f03be0e9702567685c8430dc84b5251a6f86b64c9d066b92dc1e482
font_02_sfnt_off0001201f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201F 10448 bytes
SHA-256: bd6533c4ba8a24f843c7f1537008fe9a7f637338663bd36ee32eb466b6d48481

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