Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbbce074dd69ef8d…

MALICIOUS

PDF

84.7 KB Created: 2021-09-04 23:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f4fd9ba20b15f032b244e8cd89c0531a SHA-1: d238eb7bccbfd11690aed3d8fe247bd1e0129b04 SHA-256: dbbce074dd69ef8db5238d946460b8ebeab01223693564a1585c1618416de6ef
184 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised WordPress sites, suggesting a link farm designed to trick users into downloading malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://adabaskimerkezi.com/upload/file/78264996247.pdf In PDF document text
    • http://crm333.com/documentos/file/fisuwukuxajupokomizifex.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/duvatowomarujabobumino.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/6098797673.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/64177368176.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/16043195534.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/51612339564.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/38309590899.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-19/20210519053740251608.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/lodorodajilo.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/80551084547.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/kajurovifijeto.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/rofoli.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/t57d67nrevgc8fq2s4rjddruj0/zujupanokatufoj.pdfIn PDF document text
    • http://sooclose.eu/upload/File/21832126317.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/d1695a56a47f98c4f9317b8dd57d0653/fukojirijonokazov.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/puzigavipakigolezurixom.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/babozanurejufolazis.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/59743804723.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16116bf6c727b4---4041695217.pdfPDF link annotation
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/unp5jadmhpasol76frf0fmh0j8/papufofezenekotaduj.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079283a976c0---zisev.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cd337a7b9---96764642979.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/tebivogizokop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=structural+steel+design+solution+manual+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_off0000db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 21312 bytes
SHA-256: f84ccd0147a96df2f0f9149ee813e705a37126cdcad5e36d7fa1f1fc1d72a5d7
font_01_sfnt_off0001131e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B35 11136 bytes
SHA-256: a58c41ac4396841662070a43eebaa9e6f22555e63e201a1e3e2bf3d1f3c5f2cc