Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e57265e03d053e6…

MALICIOUS

PDF

90.7 KB Created: 2021-07-02 03:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9155cbc42a528736402b02bbbed1f8fd SHA-1: 71b88dd9c8280cecb862e60a39ed065865fa2f0b SHA-256: 9e57265e03d053e6558d46adabd703e06701a8d59385c8c951483ac89955231f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a90d019808198d3e7e02e080daa38aeb/lalajanof.pdf In PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/b6857b71cc660bc452efac2575ea23c3/23496671440.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/dusuvopifu.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/27b96d509abe8644cab2ce9bd30da48a/81484549183.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609616ef620c4---naxatesafikofazugafuf.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/d6b0761a07d9f0337fc311d1e016ac69/2734599588.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098787b1a3e5---mapipumulital.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/8b5b64b300f1befffa3728b3070f247e/49939442864.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a509947a5---80065685425.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/31150865233.pdfIn PDF document text
    • http://nensi.si/upload/file/xozujuwel.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/cb535558fe2fcf62258e14d523f24d3b/47215314807.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a23f4da4c6---kalazatezaf.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/65680370710.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210627075852.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/0letl4vdsa8kdgo5ori8bag8h0/41129003186.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081c70e68235---razipefexoketegebugaze.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/68512780514.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/21527706752.pdfIn PDF document text
    • https://5uempat.com/contents//files/44028220646.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/reper.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/8c4c30c45ee229b1a86646777335dd6a/gosuli.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/8871849382.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8629cb03cc---gizobevubobolebedela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+surrender+experiment+free+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_off0000fd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD61 17120 bytes
SHA-256: 39131b0aa5438fa209c3ae6a14a39d8e695f901fb056a9c4dc674093977d13fc
font_01_sfnt_off00012a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001425f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1425F 11016 bytes
SHA-256: e6b7c174a6d61a481fe5c3d682b9936f62f905a818ab544f2d8927e907d9efe9