Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6664ad97e04519…

MALICIOUS

PDF

77.8 KB Created: 2021-09-05 05:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9f186c62debddc9b9fad3a1e8e22e124 SHA-1: ebaf4db72cc1a73c6022c2809fe53b5fcaa0057c SHA-256: cd6664ad97e045197e73b5a4166a6ad10029d4e936dadaaf1044c69c949bb8fb
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609711762310b---vuravigano.pdf In PDF document text
    • https://paperland.bg/uploads/file/45001526173.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/84943581599.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/60fe0fc4cc7cc8f1fcd5b99835cfc952/wofevokinew.pdfIn PDF document text
    • https://sy-tech.eu/file/93994944536.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/48586193696.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/sesepejunupeniwugamarulax.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8kdjg2umtg5440p690m4a55vn3/44576693983.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/2b6cfac770dc6734e9149c3a1d304b37/vozivurotojexolupu.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/xujexarik.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/087991b0e3bc08f1bc83124b6c64d083/83870621240.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/mujavafopobo.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/6813196858.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/3d6b8548106579be6a57646577c539f8/37434691139.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/fawalalemexifesojag.pdfIn PDF document text
    • http://rurisnet.org/images/file/gawanepozedog.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/31736584963.pdfIn PDF document text
    • http://guitarenko.fr/img/files/gexepapogizobagigove.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/db5d56ca8fbdff59c950b0c9f1b03d00/19312106127.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/5502171156.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/55074929862.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/0af185ed49ac7d59c7c5b01efea8efb3/47161896572.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/fde8e57333ea8170dc5fc7d956c2ab8f/25324405143.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/12945842474.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/daxabidava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=halving+numbers+worksheetPDF 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_off0000cb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB64 11032 bytes
SHA-256: a6800606301fef009f5a57e70fc0aacbae89c1b8ee0f33eeb35e89fc1a39496f
font_01_sfnt_off0000e4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D7 17220 bytes
SHA-256: 943cdfeb90b652cf249f18922c712d61f20872e86f1706d9c900dda0e2e75ac3
font_02_sfnt_off000111c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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