Malicious PDF — malware analysis report

Static analysis result for SHA-256 33177ab9ef327359…

MALICIOUS

PDF

74.7 KB Created: 2021-09-04 11:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c126d60b3db5b7d7b543b164c626a84c SHA-1: 5c3421e7f9b1d5005cf03703635b4a26471b5958 SHA-256: 33177ab9ef32735984fcafb7cdb739ff31a4f793c498f13c0db8c13e3751fde9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://qian-ho.com/upfiles/editor/files/dokudabogejaberawe.pdf In PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/1175a3170c73d80f72df32f500c9cc43/37124310832.pdfIn PDF document text
    • http://domainecomps.com/documents/files/5501054291.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/zaxutejebamepazera.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/2aff9e846c3f1c5bc91759f40017d4bc/11852445792.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/gepetu.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/67890314335.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/jewenebododigujel.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/4p9lvlm6i45ptd303ijqkk1277/49420825770.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/73215348142.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/a77199ccdb8409eb958c29ff5653183e/roniraxoloje.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/jezep.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/22067926112.pdfIn PDF document text
    • https://clove7.com/userfiles/file/rizigexuneg.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/776878350.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/204b78f304f2e241b0d325f9fa2c2006/barawutirerawaruguzub.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f7bccfb46e93ea8bd5da7227247731c2/28731434135.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/82016578440.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/zuxibonavewifol.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/gedesomunujebosijotibo.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/suruwetesuvejutuxe.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/71069092928.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/23224708214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=factoring+quadratics+practice+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_off0000bfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBC 10972 bytes
SHA-256: 5342409944166027b771e1b0f28cac669f345e2fcb8ca7ea896f9d8a223b0de8
font_01_sfnt_off0000d8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CF 17120 bytes
SHA-256: 3b99d7651d61179a5ce16c0cc0935b62f4f76a6c8ac20203490c59993cba7744
font_02_sfnt_off00010510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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