Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93679e1ced3fefb…

MALICIOUS

PDF

82.3 KB Created: 2021-09-15 19:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a83138b076354c8fd1d5ba543e626a1c SHA-1: 99b1bc2fd7895e97e89cd1c0279e94e721a0b9ce SHA-256: d93679e1ced3fefb04a2b7830ea9ad85a52710d5e1bc35d69be4c947d3273ac7
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which host further PDF files, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/f9d1cedd53486c6719444a4fd4f808da/jujelagifex.pdf In PDF document text
    • http://pasted-radio.de/web/files/dapojiwazud.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/foxewet.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/66909134556.pdfIn PDF document text
    • http://shopabrang.com/images/files/85944911552.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/65682199747.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/jatuda.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/bebuzu.pdfIn PDF document text
    • https://icbacademy.com/upload/files/24905135745.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/xazesaxomibonibupuwipa.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/67092873189.pdfIn PDF document text
    • http://thegioioto.store/upload/files/33373365949.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/nibobanezo.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/99888801341.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382f4e3b053---rapipun.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/48479973411.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/75841035846.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f96ea629d5---90278144588.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/mefowibilejexumom.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/mufilol.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/bevotodolapokimuwosafor.pdfIn PDF document text
    • https://wittnebel.dk/file/selisepinizipusewemafos.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109090608211061.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/sakenidurubotezopi.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/xinutuvuvutoboluwa.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/fusazawiwodadukewidib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=can+i+see+instagram+private+account+photos+without+followingPDF 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_off0000d9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 18272 bytes
SHA-256: eb773271d2f5aad7c562d53c9a0a6936e4dbcad053d1714e706c25736b1c0f85
font_02_sfnt_off000120e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E1 11208 bytes
SHA-256: 3bf4b91cfdad7505c2694b4e5895290b1adae2312a4a78f6583d46d23ffd2a7b

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