Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ee82bb5f7c5e7cd…

MALICIOUS

PDF

84.5 KB Created: 2021-08-15 17:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a78467ef557126cb6141fae34d3517e2 SHA-1: 777bdcbc92b93d9ccd8f2043272394d8dbfaf803 SHA-256: 1ee82bb5f7c5e7cdd05c808a31b8d0f0cc6d575bec587898b88a8c49a14a5e11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest the document's purpose is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=how+much+is+coaxial+cable+cost PDF link annotation
    • http://falerisztika.hu/tmp/vixes.pdfIn PDF document text
    • http://777mto.info/contents//files/56756152328.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160acfbff4e850---vidan.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f78edeeb3---rajuzofi.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/34119542530.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/junabidovononukanijoma.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/lovatuwilinaril.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/848gup15p746k08phbvqtn3vrh/duxibuxoborizobamir.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d1d3ecfbd---90683290906.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/p6blpqthjlg2op595mebndc3p2/jusukozefeseguruw.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/kosabolilo.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d4a7228f2---pidurudusujo.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/6390786447.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/3000691775.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/12895782977.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbadccd1a8---tasop.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/titudategafiligugiput.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/wugipa.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/49255936861.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d25f6fd35---56679036470.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/9adojaa86ligdub3lfr52evnk1/kugijufefibidofufeg.pdfIn PDF document text
    • http://aquafilling.com/userfiles/file/97524648423.pdfIn PDF document text
    • http://meadspool.com/clients/8/8e/8e46726fd42f39913d2349bbdb4e70c4/File/kofotawuvugefatarelipin.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/pupimigesusilirerezemug.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_off0000e7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 16728 bytes
SHA-256: 100632c52817adad4fc66e623d3dea4ba2eae2b3dd87b35469124b22680632d4
font_01_sfnt_off00011386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9D 10708 bytes
SHA-256: 939e8c20ccc6a551507a9c5d8f4b2bdfebebb4b6770cd3c0ba2e3c2ee3d000ef

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