Malicious PDF — malware analysis report

Static analysis result for SHA-256 5541b645d7b24d79…

MALICIOUS

PDF

76.7 KB Created: 2021-10-01 18:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7f243be54a9f50406772b4f66c456ec8 SHA-1: cfeaa0679c5569596765682844446975846a53db SHA-256: 5541b645d7b24d79e41188a29524714780447502dc3adef0a551e3a4e249c9f9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. The presence of 'utm_term' in one URL further supports a phishing or spamming campaign. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://philabc.ru/uplcv?utm_term=mugen+naruto+apk+android PDF link annotation
    • http://tichdiem.surecare.vn/uploads/userfiles/file/92773188499.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/tixelipojakim.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/kujalilupixifidofo.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153cdf01219d---6196861399.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/93046566092.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/67be44eaef96eb5057060e25a86daf5f/86629678444.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/benixejebikabawatifa.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/14084767797.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/64701904304.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/53790444203.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/86ae87b01e675603abec897504f7a954/sururopuwopoda.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d8a8f31d80---59233338393.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/28585426479.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/95596514658.pdfIn PDF document text
    • https://maria-galland.ru/files/file/kanibenedavomenod.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/66688640594.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/46640152292.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/saladeviroresov.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60075153486.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/37707822746.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7764495ddd1e73010d7bc055caaaa6c0/94841768593.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/fafumetopulude.pdfIn PDF document text
    • http://cycling-software.com/files/file/digat.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/nikotodozegafazazi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f17a20795---32206261384.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/gupetugikunotirutusut.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_off0000bbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDA 10536 bytes
SHA-256: 47fa549614869c8a9d30b5bf57361b64897f46458782779ee159ec9649e6b09e
font_01_sfnt_off0000d3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C6 22620 bytes
SHA-256: 84a3abddcc6618ff14de64ab4a306a69fa03b1b9be7eb2aca1cd1fdd19e32528
font_02_sfnt_off00010d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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