Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c54986e676e2c62…

MALICIOUS

PDF

85.4 KB Created: 2021-07-13 15:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 28c6915794aa75ce8b95e9be9148e16d SHA-1: dacd3f80f23b6cd477e2506a1cb7316ac0f2c066 SHA-256: 1c54986e676e2c62d7610067955cccf58289a52534dd17da30c76a5369aa4e94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, likely serving as a distribution point for malicious content. The document body is unreadable, but the heuristics suggest a deceptive lure to trick users into visiting these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/e65596e8aa6a028e67fdcd1118f478c9/9879201213.pdf In PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160728a6d48986---57151590019.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload//file/durowixowunudagafekagez.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/7bf662ebd7b1eb6a99168f2478f2570f/tujekufareko.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/68307361247.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/mezezumo.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/13136904913.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a304f7cce64---wufulurulutixeru.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/94428542906.pdfIn PDF document text
    • http://attlas.center/userfiles/file/49936974544.pdfIn PDF document text
    • https://tonitomov.com/picture/file/58176950980.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba4fe4e7ba---doxidaxatifoduligesopeb.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075fbe7e16a5---gaxikulugepewuv.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cf0d4554588---pizowesemijixuvigen.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/8ed5519dca606fc6c90901d7b5e47b57/13328454463.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a23aa34ab90---37666789736.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/51701274843.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/13893753863.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/60021168559.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/debegemedafanalorumoma.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/lafafefosunija.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/cgl3biqoa6qbr7bi55cj43rtit/72438668478.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/32620160419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=business+gas+and+electricity+price+comparisonPDF link annotation
    • https://mediaget.com/userfiles/files/zifulejewipovitubatowonun.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_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 16812 bytes
SHA-256: f014dbbfba303881a1834e1fa15518b12d451bf89ce00589bdc88066533f69bb
font_01_sfnt_off00011635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4C 11124 bytes
SHA-256: 98498bf06afc6bf5c344c68f7b03da8f5c80ab274c840b82e4174f6d6a14ba44

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