Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff4bdab98d138bc…

MALICIOUS

PDF

72.7 KB Created: 2021-09-06 06:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db7dda4008fdeb2b86753ad8f8d15592 SHA-1: f9f360e560ec21f2aae898c4fbfe0c8509feced0 SHA-256: 0ff4bdab98d138bceba0a8de7e6b9f7322851cd7db2c23d3ceb1186d2b9377bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://enovosti.info/ckfinder/userfiles/files/46514378319.pdf In PDF document text
    • http://makinsushi.com/uploads/files/tukevadomogevasolupu.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d41cd3f6---fugupufe.pdfIn PDF document text
    • https://wecareprogram.org/images/file/59597492168.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ankt5s7c55djar27j0k6bflod5/deligelumivipepisokanitu.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/golenivekewekijokotovozus.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/9b3daee6cfc15188024dfdcaaccaecf8/45600582915.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/82062448768.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/f294364f0aa808cccb1d099950626f76/71998773517.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/ruvixuzukijitumokogosuwop.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/tp36r6lbogf6kc2p0rhtb797sf/12859067670.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/444cefd218f88c9516e8f1dcccd633d4/67352660970.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/zepigoxaku.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/51730171484.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d5aa2e3ebaf---70117196373.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/15464536523.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/vudalukab.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/fematizefe.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/1547926471.pdfIn PDF document text
    • http://technocom.pl/editor/file/tovepikusebuteziwobuwuf.pdfIn PDF document text
    • http://e-district.org/userfiles/file/fanetimotuzuwanegafuzozup.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/57433104297.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/218765014.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/sarelolakiwojoxenib.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/d1068e2132537db7870da0593d06c1db/figaresowidiximovut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=aquatic+pollution+an+introductory+text+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/968101e11c17ebef1f8a82197793b41d/zotuguzevidekovude.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_off0000b689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB689 17248 bytes
SHA-256: a38d1729070d10c646b19aea5c0a12f61d9b06f578c7e12f497778bb49133946
font_01_sfnt_off0000e3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B4 10888 bytes
SHA-256: cb6ed3007f22761f858156ed6e4474574df843a86f15fcd0110c2f41c2e1b161
font_02_sfnt_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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