Malicious PDF — malware analysis report

Static analysis result for SHA-256 52aadafc1db7ecdc…

MALICIOUS

PDF

104.0 KB Created: 2021-06-26 11:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 01ba1aae3d2a663efc1e7c4de23f0a5b SHA-1: 26dda29d58d0c8ad201da58fef1f68db606ff9a1 SHA-256: 52aadafc1db7ecdc0ae35ca4f607c4b0831e5f61c95bfd5ba20684c2acaf90ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload locations and other suspicious domains. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to lead users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://irlanc.ru/uplcv?utm_term=the+children%27s+hour+monologue PDF link annotation
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160779d8305cbf---demenijubogapebuxifanope.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160974b36b4b3a---35474904755.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/69053586304.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608491e8099b1---surijafix.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/kivobexipil.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607838d0839c6---20583950700.pdfIn PDF document text
    • http://redfordunion70.com/clients/869360/File/totewosafosijofeguf.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/27556494065.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844801ec58c---76151028673.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/938ffef1f85c94cde1a2dffa8bf06365/jebif.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/59893139137.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757a34a40ce---sopupasabuwugin.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086124cd1c23---kizon.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/timuxilalas.pdfIn PDF document text
    • https://dietacud.eu/upload/file/jubujirobosoxozinozenef.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/57594274117.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075952c52452---70367664465.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/supi89riio3q6eftsps3c1m8qt/3009877118.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/visofomiwawafopegipif.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/tq6smae1sh9efgd05gij4remq6/83888788705.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/0ed647c99c7d5a866e83b91d56ee635b/kutikuvupiruxiniril.pdfIn PDF document text
    • https://autopratichesas.it/file/48519636453.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/79185793144.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/u72mcf9a8md6j310p5089vlkd7/41861793811.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/tp3p0439d2gl6fughkm15jsl8i/gudofijusezoroludafovad.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C23 10652 bytes
SHA-256: fed6559fb2734d5ede14bf47b21a77defaf3d9a7617bcb92452c4528dc71d87e
font_01_sfnt_off00013413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13413 16352 bytes
SHA-256: 3c5b36d9b6774e7e2f3fc889af402f57cc2db9de150fb6f6cf207a5d708f39ba
font_02_sfnt_off00014a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A8C 17644 bytes
SHA-256: 1b2840ccf7e07415a33388558b58c583f5eb094e81f0b170f6309e432abda4de
font_03_sfnt_off000178a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1