Malicious PDF — malware analysis report

Static analysis result for SHA-256 56eec6a8f2991b84…

MALICIOUS

PDF

118.0 KB Created: 2021-09-02 10:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4d697155c6a093ed0ae5142bc5d0bfdb SHA-1: edfb0b617c74b807b7fef92d1d5639d86e6b0271 SHA-256: 56eec6a8f2991b84b374930eff000a19b744265b35c06280a5b6f8fe01401ada
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malicious content. ClamAV and ML classifiers strongly indicate maliciousness, likely related to phishing or malware delivery. The document's structure and URL patterns are consistent with a spearphishing attachment used to redirect victims to further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/j4lomuqc1r1j33o6a2pb3hh8op/sadogomebolexusakulupul.pdf In PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/27567421977.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/8b80683d5f9b060c331ca88ced32502a/tewarirezemodavigov.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/56937441792.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/gvtkqfftu9uug7d18jb1l4hop5/53031622787.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/24514568069.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a252b93c1b---85085555019.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/3744912742.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/fulenosipaburita.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/sunojozikizutijosupurib.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/35233832567.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/88789004887.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/4064375387.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/48289343203.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f41b859b0cec74bcce969df4ffa0f173/radet.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/46691070159.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/kenafowobopegibogib.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45d279e6ed---tamafemopoxuzuresumo.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/nuvepe.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/dojojelaninewapekekorosir.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/21bb5e45ec679881bfb0b0ca8d4bb610/60216331221.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/17591934651.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b95ed9b0a8---fidamigup.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/21816732790.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/47321482267.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/d26c3e45000fe19a171b7cbe2a882a4a/66488356819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=michael+sipser+theory+of+computation+pdfPDF 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_off00016109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001791b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1791B 20676 bytes
SHA-256: a867fc0e2f0eb7b9189a601f6fed1a89ce6ebd78c42ecb72e285192bdd4343d8
font_02_sfnt_off0001afef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFEF 11092 bytes
SHA-256: ba6d52ee02797b975e09600e3650b9014809be58ed84c559c5ad7d1da02b2752

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