Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde8fc52c0ffe900…

MALICIOUS

PDF

78.1 KB Created: 2021-09-20 07:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e045450d4693b8f41a4bf459916fcffd SHA-1: ef982a4b4cec45b1368bfa7420476c5a77b8dbce SHA-256: dde8fc52c0ffe900586e966e53cfc3a54f705822b373591b359abb939a2a4f94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://chcial.ru/uplcv?utm_term=windows+10+pro+home+download PDF link annotation
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3d545a916---lizutafomamatirub.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/modivugetixelut.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/burasozunamitakag.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/beloxokakomazixesusijo.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/vujemipigovoza.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/gugimewejug.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/7657643059.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/1fd9ebe6b0adf2f86cde332f4fbbaf1d/kizudiwexabamub.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/desowurez.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/jafivanuza.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/73863731617.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/80902147121.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/wexodupopadugip.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/vowulexobumexenefapo.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/ketigotewojegaramuj.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/79150100129.pdfIn PDF document text
    • http://www.moyekolodin.com/files/madadibu.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/wunepoxoj.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/36926574689.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613de1ee59157---17837475369.pdfIn PDF document text
    • https://shinaltd.ru/images/file/19739507632.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/dipomedugejulurebupej.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/vigalo.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/78922640455.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_off0000b5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B1 10812 bytes
SHA-256: 3757b18a7494ef42611af1019a00072aaca2d29cabfe96376be9fdeb3a6a0390
font_01_sfnt_off0000ce6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6C 18364 bytes
SHA-256: 6171b756a5bfec47e44659f35dd19f65d01c80ecdfbcd0d12d4fcf8898fcbc80
font_02_sfnt_off0000fc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC83 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_03_sfnt_off00011271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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