Malicious PDF — malware analysis report

Static analysis result for SHA-256 eddf83cb59ad28b7…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 15:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8da66fa7278d04fc82a5c8231639ae0f SHA-1: 48326d1a0eaf7d17e57acb3d970c5543b44e74c1 SHA-256: eddf83cb59ad28b746f5f0ec4d0f9dc01b29792ddc893507932ec919cf1b1cd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to trick users into visiting potentially harmful sites, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://istanajp.com/contents/files/kejipimenikaruparoxix.pdf In PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/29183960185.pdfIn PDF document text
    • http://nensi.si/upload/file/pazilefirowojiboka.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/suzikujajiredijugux.pdfIn PDF document text
    • http://mega.kz/media/upload/files/digap.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613998f88b699---lalavenegapugajiwunori.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/21494969346.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/65183568124.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/belerirosoxaronazugixin.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161360d378e335---8003573682.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/95356222987.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/nekikiji.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/16091493941.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/lilegop.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/12125116358.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/nidaran.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/wirakuvobosarufuda.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/85602517850.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/medajavasosi.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/24180423572.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137f354d5328---lilivebutal.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebed470d5f---21153948817.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/448604120.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ps4+apk+free+downloadPDF 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_off0000da89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA89 17376 bytes
SHA-256: 1d992575fbb711794b7501ce61f4a7c077d999125f451f3fbed7092d684bbead
font_01_sfnt_off0001083d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083D 10560 bytes
SHA-256: 008fb495973fa948797be8fe4ff4c5618356c94921b037595a39fa8c616cfb00
font_02_sfnt_off00012091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12091 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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