Malicious PDF — malware analysis report

Static analysis result for SHA-256 181fdf3032b7cdec…

MALICIOUS

PDF

74.2 KB Created: 2021-09-04 22:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 33037323f5a45833ca2ea626e35f9a20 SHA-1: abc823a77f5f933c0e0b9bfffb6a9c11f8a71e18 SHA-256: 181fdf3032b7cdecbe686a3b3545bb45d98adb6d8f387d08414a4b2650cdf20d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely serving as a distribution point for further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to disguise the malicious nature of the links and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://allytemp.ru/uplcv?utm_term=word+problem+division+worksheets+pdf PDF link annotation
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ab27a7b17---jedurebawi.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/8369bff6c65ec2b5f473f596947729ad/48357635440.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/livozogaludex.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/98114397316.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/58981730769.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/vorumafij.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/680a816c24f8f1a8efa60e0ee96838d4/55373155295.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ed850fee3---1753343552.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/21213803284.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tisinowalejekazumenadoken.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/415e4bbacc0f09fc7235c3fc173e943a/lubomiwabusorotezu.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/d40295cca9350db732a8479e0e54c9e1/rivazidonesokugetuziko.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/72869791604.pdfIn PDF document text
    • http://neenah1976.com/clients/17995/File/68473124853.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/1910a167b6e83b98aaa7e1a79e69411b/lamezosozixanama.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/feloripijurutitovela.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c34f35fbc---89647386000.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/13490193513.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c470bcb6869684fc7f97bf47143c7ec4/vemuwi.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/54604353262.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/d48593c617b056125a3db2a094429419/suvufibewabesos.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_off0000bccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCF 17784 bytes
SHA-256: 604192c501f1e4d367c46692039a707340b2afe2951d9b04bb2863c3f8227f5d
font_01_sfnt_off0000ea26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 10980 bytes
SHA-256: 0e8a1044fe78ed116e4f0a7d95b84cc7a9725cb4da1a0907a5cd6176a3580c1f
font_02_sfnt_off00010334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10334 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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