Malicious PDF — malware analysis report

Static analysis result for SHA-256 b727c5d09bab7f65…

MALICIOUS

PDF

70.5 KB Created: 2021-09-24 21:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f1bd9b0c6547bf27b67a4deee14e198d SHA-1: d9887c54b795e266149defcb8000f3e2f43a5352 SHA-256: b727c5d09bab7f65f01c4a402557f5b1cd25b31c32a40908b7d347ddc75b2606
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is being distributed through these links. No scripts were extracted, but the nature of the URLs and the heuristic firings point to a malicious intent to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=el+libro+de+dzyan+pdf PDF link annotation
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72507418602.pdfIn PDF document text
    • http://usmleworkout.com/files/file/xasefetemonuvug.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/xozozimulapogarenigarixib.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/lugowaxumi.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/12051056975.pdfIn PDF document text
    • http://vuason.vn/upload/files/sogoluvedilunovireroruwuz.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/41308559279.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/m54vp75qtqrvpb0l2c18v6uj9i/82560824387.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/a56e00ab225de90f3ae79b9061a9756a/50342192328.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/83493902482.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/34801980573.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/jeripesa.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091814501173499.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614009180f2c1---931490134.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109210753229101.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/3317047d66c49b3bb58c5c719f2634c5/nenikupilulasuzafozem.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/zokowonubedug.pdfIn PDF document text
    • http://sjanzee.nl/file/lesogaserer.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/folanekegowadadebekexexe.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/jerararemofirakupusi.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/61646997325.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021911021242125.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/rewabiguxilosofox.pdfIn PDF document text
    • http://sinostandards.net/upload/files/23946288271.pdfIn PDF document text
    • https://uangraja.com/contents/files/79700473252.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_off0000b50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB50F 15652 bytes
SHA-256: ec447c5d58d444ab33dbd9d064b4b2716e25d212f1418ccb948cc73bdbb59972
font_01_sfnt_off0000dc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 10524 bytes
SHA-256: ef16dcf1cebbfde197ed314b7d6c6df9dec77557aa4f4bc23d667eb7a13fedd6

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