Malicious PDF — malware analysis report

Static analysis result for SHA-256 b598f1e2ec0004af…

MALICIOUS

PDF

73.1 KB Created: 2021-09-21 10:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e5448b3fd15e4ec8c65138548edabf1 SHA-1: 93bf699360caa7bccb3f3202d4f845f9042f6a94 SHA-256: b598f1e2ec0004afb2685cf295d566dcf14b46824d1e627f53a4e9c737e68985
176 Risk Score

Malware Insights

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

The PDF 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, directing users to multiple external websites, some hosted on potentially compromised CMS uploads or disposable domains. The presence of a raw IP address in one of the URIs further suggests malicious activity, likely aimed at phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://xn--365-pn7mwb654m2qn.com/ckupload/files/59581243319.pdf In PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16138e09bbff4c---bodapadefedirigoto.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/21cc654da9rmd6prd7693k52a6/wososa.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/3319005727.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1614982e7e776c---vugaguwo.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/65159013032.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/13955524750.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b7520bd2e---70666696005.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fffb1acd49---2044418145.pdfPDF link annotation
    • http://incomingmakedonia.com/files/files/59276933626.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/68355061208.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614481d35b3e4---77585742132.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/pemavuso.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/zonelob.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/mupitimedoredebironop.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b515853f0---90858211764.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/zedulugisefofizilure.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/juronap.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/55299557593.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16133d59e5da54---91908041379.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/78278292652.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/53926698363.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cdeeaae19---denovaduxemixim.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/wimukakimujelok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=forgot+icloud+password+and+emailPDF 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_off0000bade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBADE 16492 bytes
SHA-256: 78af63d9c343aa06ade85f3df25f8b071d29e44bd431954d9ccbafee2e7c449e
font_01_sfnt_off0000e5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC5 11020 bytes
SHA-256: 69e4c3326db92bd61875ff381e96a37c8bad4b20d61a2d5fc03080f2ef11cbc7