Malicious PDF — malware analysis report

Static analysis result for SHA-256 36690fd26ad9609c…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 10:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d45311f326da7d8f85eb85d2a68deaa2 SHA-1: 30d7cad12bee26ad87324dbbc998a5303442c759 SHA-256: 36690fd26ad9609cb9f270e016faf31f59606ca67b9b34a40a0a28373ac42d64
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple compromised CMS upload storage locations and disposable hosting sites, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit vulnerabilities or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://signika.pl/Upload/file/bozilik.pdf In PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/zudoji.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/pokise.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607432ea9470f---masilusumuvav.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210714_A5C9A84BC3FE8325.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/32372278151.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210619044344_1227971626.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/6381242641.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/762a4267204db6a10cd10a3af2682cd0/78823919879.pdfIn PDF document text
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/xurolugazatifevugonubuji.pdfIn PDF document text
    • https://shidoremicrosys.com/media/45693550074.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079f7b498f32---dimigafawokazifenebazip.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d54ab84f2bf39a4263b5b336ed7e3d6d/pazexumuwifotop.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/92131729030.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/88154555306.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/valowadotimironawugaz.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/72801015858.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877ff366679---73208914376.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/b96e1c541c69ec302047cbd3fc66859a/91358267900.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/jomusuluruwud.pdfIn PDF document text
    • https://proxus.nl/file/nigirosagotaxijomog.pdfIn PDF document text
    • http://starke.ca/clients/84205/File/sijefuvotitakasekili.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/28147297917.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c34513d640---nasexuji.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53b0316b7c---20079447848.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/62669434626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=latitude+and+longitude+lesson+plan+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_off0000e23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA54 10632 bytes
SHA-256: 1601ccddf9415a4fc0e0ed9954980e61df06343bbbc9c768fe4266f3197c4c8e
font_02_sfnt_off00011288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11288 18200 bytes
SHA-256: ce91918e01efea33c114d4418463edae0b742f4e5df612a84eb226c2cc27f563

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