Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbe5ec5cdc651793…

MALICIOUS

PDF

89.0 KB Created: 2021-09-06 02:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: adada6eb167236786756960a95c2d09c SHA-1: a6c819ae988df8ca52d5a84a4eaddc6162b5fc3e SHA-256: bbe5ec5cdc651793beeb47c81d8d5866a37d526b73b7f7b62b39dc32a4cc73bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a0b9a3103---folujokitodekebipalobepa.pdf In PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61613165019.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a54b6d33128---1895660387.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/d0a052409f20df51a2dcc9017bca1080/92508618483.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/6ace4f9c3b9b4cc5ae2972ac43b3f3da/padalalukasowefugaxuwowu.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/gofesilapara.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160842a2773777---14539692379.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/wovupoteweki.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/16265316715.pdfIn PDF document text
    • http://allasclub.com/campannas/file/30013090597.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/lukevejagata.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b31b2a35ca---pebeginud.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/92777262562.pdfIn PDF document text
    • https://jobtiara.com/files/files/pigopakuleximatifaxofuvi.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/9873f6d3773ff6db214f416652e4b3f4/rupitezumalekig.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a11c1f982---86831411793.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/86g2v071ckod6jgq59tirg84vp/rizituduzumavewewatolu.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/92720109498.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/70220133620.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/11265612775.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608aabd60b499---97817369659.pdfIn PDF document text
    • http://ymy-tea.tw/upload/files/zuvelatujil.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/92574598521.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/dekusonosemototuzikuf.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/38401968991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=congestive+cardiac+failure+pdf+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_off0000f6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EF 17500 bytes
SHA-256: 53942441b90e5b590c00bc4738d0a43661c6baf30ca19e43ef90c07b5af87c41
font_01_sfnt_off00012470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12470 11080 bytes
SHA-256: 8d6cf18e9db505f8f71922aaa318783a676cf941d7639866ead5cb349cbf08d5
font_02_sfnt_off00013e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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