Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41fb181a665cbbe…

MALICIOUS

PDF

92.1 KB Created: 2021-07-16 15:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29238e675d59e80f8fa6e14f966e5664 SHA-1: 85ab17bc39beef57667ee216ba22cbd5e402a342 SHA-256: e41fb181a665cbbe32cd9b779fb8ad3b4feff149b2859dd1cf8f1cc644b09464
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://huntic.ru/uplcv?utm_term=how+do+i+save+only+part+of+a+pdf PDF link annotation
    • http://naitikfashions.com/ckfinder/userfiles/files/zowetalad.pdfIn PDF document text
    • http://point-grey-1970-grads.com/clients/f/fe/fe7686cf254963525dc0bd811951f15e/File/rovas.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/sepipu.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5be03a06d62206a8fa2a4d0bd2753de1/bujuwufudidewigovukufaz.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/kafepasagekafavowunafo.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc20adedc5---sidoxu.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/vigisuzoji.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/f74bd3bfd4432971bd27b683f74b093e/loxulesa.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/99878223483.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/25556619816.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/43e7d5a43c292879746683971e1620bc/buwalosumegemim.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091897513d63---patadewazijopekokuna.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d23f3ca0f---60773882707.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/56b30636c96b8c38f7f9f41516d70ea7/nugasinefiwasenozim.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099346bf121a---xonujopubajili.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0185d3cfb---kemoxajubedewusekobonitig.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/57725163268.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/7ebmmtcaqrud1svite3265iq0t/84968548245.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/6255613873.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/365691dfa072e9fbdaece9d005bb7572/54106435459.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad95f52d95---duziberop.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f601f43a5d9272267b90e179d3f33caf/781959579.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/jitubinawagolanodovazuja.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/medoxinazimi.pdfIn PDF document text
    • https://geniodelweb.com/file/xopumikifutubinad.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_off0001039d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039D 10748 bytes
SHA-256: 77d4182969c33085f461c9ea12c09eb3554bdbab62f6400e9ec8936f16961481
font_01_sfnt_off00011c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C78 17744 bytes
SHA-256: cfab17e18f89ecbce7f72b683bd013fd0079fce537bbdc9e58cb310670e17e5f
font_02_sfnt_off00014ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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