Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7687678bf36723f…

MALICIOUS

PDF

85.2 KB Created: 2021-09-01 21:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f21b5d4b76edd1b76071b4b1099f9ab6 SHA-1: 56439e8350b7fd8e37c9e03c18963d1f111822d2 SHA-256: a7687678bf36723f2c99e6817105633f95c447a279b0ab49e364eb02bc8d5b46
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with exploitation attempts to deliver secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://atonoserver.com/userfiles/file/23135979763.pdf In PDF document text
    • https://bataretak.com/img/files/file/43497279899.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/57039733692.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/lesakik.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/26026650402.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/radaluxudoverufas.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d2aece4c5---godobowifakijifopunu.pdfIn PDF document text
    • https://luminex.pl/upload/file/52198571279.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/lafepobatofetuveg.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/0fb2bf6f705bb30a3195439666c6bf82/66818045022.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/tasopuwi.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/9bf779fc029239ba4fe0e71e95eb98e8/zafujude.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/49397439494.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16079829810147---zawaxum.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/5e4f4dbe7661ed15a5cbe2923b28b9ae/miwowesisovox.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1610823da863c7---76734486144.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/0812281e655e62e6ab77088d8386efcb.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fbbc5a7ca---49473780035.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/97685395201.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608785aee9e2b---35671599286.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611714c6b9a13---tuvopategowikewapinaduf.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff8174657b---46667258963.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/tso9m5misjs3mht76cgvu704jm/xigapawemopo.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/70639019965.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/tezetumebejas.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/lozomexesuxesidamuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=expository+text+meaningPDF 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_off0000e5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D0 18304 bytes
SHA-256: 6588894372c33b3dcae19a6fad5e771cb28dc68da76a8b3b98f05b0646cf8d97
font_01_sfnt_off0001150b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150B 10748 bytes
SHA-256: 53ef11486be032833a6c10e3a846c5b4c6c67f493b5d93a45c2d69ef18962623
font_02_sfnt_off00012dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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