Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68f41411a7100ce…

MALICIOUS

PDF

88.3 KB Created: 2021-09-01 02:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 856fede9540848345aeddc067de424d2 SHA-1: ff907f81c58ad36d3c8e078377b7af6a3b568d53 SHA-256: a68f41411a7100ced7595d56160a86fd314fe48fb3b53b852e4ae1e188fb2b0d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=hypothesis+in+a+research+proposal PDF link annotation
    • http://alpanelektrik.com/depo/sayfaresim/file/zonovufesupizi.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/kogowokidamer.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610a9607910fe---namerasawekikafemakokalu.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/959567b321b374491a04d49bce53055c/namoki.pdfIn PDF document text
    • https://bak.vn/upload/files/10502643187.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/55273056829.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/96670151304.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/5a9cd6c29cc417bb6013bc3f38b381e0/dadutakujo.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/51654281813.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/2108300448264748160nibg.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ro58db8baoh7dbfniam2c4o2mj/felewapovisalogupifem.pdfIn PDF document text
    • http://budka39.ru/files/mofanazimobovegupexaxateb.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075f32eb3815---45015388359.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c53773e7a---4282907176.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/57170080400.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3acc785c08---bimuguni.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/55329195.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/rovesazagovimukejimubakaj.pdfIn PDF document text
    • http://praguetransfer.com/files/file/kofinonufedukumodisobabit.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/27167704138.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/fojesodel.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a44ab2a2148---tubaduxotuzosopitogupi.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f72937b85c---86882874385.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/41103975602.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/94593502621.pdfIn PDF document text
    • 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_off0000f1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CF 18264 bytes
SHA-256: e0c9536b9125c784adb73f2c43cde987ccc0fb7cb557fe430af5aff434e3c63a
font_01_sfnt_off000120ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AC 10576 bytes
SHA-256: 0d0f7f8560c733be391b49e02c4d69a049f2c457a4287656486c177505a71dc2
font_02_sfnt_off000138c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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