Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc73e1e759be862…

MALICIOUS

PDF

228.6 KB Created: 2021-06-25 23:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0d185b7416d0ac5cad239a0e1057229a SHA-1: f36adc7213b7ecb462cacd80577c6f0278e44804 SHA-256: 8cc73e1e759be862c7cd731eed974b77b247d99551dc7e9bbeec9dd994de2c98
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of a link farm pointing to compromised WordPress upload storage suggests a phishing or malware distribution campaign. The document likely serves as a lure to redirect users to malicious sites hosted on these compromised servers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

Heuristics 5

  • 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.
  • 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://zuestag.ch/userfiles/files/37407899226.pdf In PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/2b1238e5232cee5c274c0c45104be805/fedulipolate.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a258709b89b---dowubenijorugonajalu.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/43150435508.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/ddf808a617d8b38b96b8a16653a43e20/fetaw.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d303007fa44---gutazufurarov.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/zaxinuxeroruvudobakijixo.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf817009fce---dumabokiw.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c03e40ec3d---gavofagelab.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790fce52f1c---68287673668.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71c2a95431---8947752135.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/68494555222.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d1c145a4c---55800640313.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/zanagenopasufutu.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/nenuoq8ca8mkv434jvn2ll4enb/91276801521.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/magom.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/defim.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/somegelasuvepaf.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1cf09b719---61889984000.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/6b4ec134a4d23dca8e016f0157784b7b/65077672735.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073584235400---nedexupusuvufigipadexedom.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/7e4af2c376d5c77b22380cab60781ef4/mobojawunin.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/21288526246.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741dbe26d39---jedarelimutukobopaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=urban+planners+definitionPDF 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_off00031cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31CC5 10640 bytes
SHA-256: 35a6bad3080f9bf61a691fc64c308cb2341b742837133c2636747ccc89f0c902
font_01_sfnt_off000334f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x334F8 21684 bytes
SHA-256: e99d38e865d9644bfb66950e4099a0621c1c89e15e6cf5ea3c2f3e8cb53cf388
font_02_sfnt_off00036c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36C80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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