Malicious PDF — malware analysis report

Static analysis result for SHA-256 48446c5642cd34f6…

MALICIOUS

PDF

153.4 KB Created: 2021-07-03 06:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 416ec94ac3dd0068b1edaa97b430e0dc SHA-1: f2eeee23941e7ccb71c23347a14629bcefd7cec8 SHA-256: 48446c5642cd34f6cc5d36a11a1d9eb5ffef04d99116df5d527131975d7fd8b6
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many hosted on compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://baxsporthorses.com/userfiles/file/jugurasubezanas.pdf In PDF document text
    • http://flomojapan.com/upload/files/xowaf.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/9f45ece029dfa39ca8d867d84b0c6aae/notolixuloxuladil.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fejidawejunigenej.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/17772a93fd7f46383f711e816dc879e0/28498895574.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/57fd949dceee3226cc1b34412984bb51/tosife.pdfIn PDF document text
    • http://sun-eko.eu/files/file/setimibogika.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9629b9d7a---ruvuzulewibegako.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/40866275255.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/tumawedesanifunumeru.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/12538e65633118cb3b8b56b4c72e5d7b/galomurexekenizi.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/55bfb8b448087fd05bec82b03f200186/rekaferuvetemijak.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/4af8ca018e98f31bf2182f51713b4fd2/viwalupisitofefovivowu.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/46356fb69f8057d6d6f6d14aa21b4e3d/zogoje.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/2s9n3fv4b2nbhk01enlogr61p2/59570067243.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/jalediz.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a5ed029f2---gawatirusufevopavu.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ruunnp3mecn0ah97bftu64bb71/46972665766.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/gogizugunerexej.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/70608061497.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/zamejagobabobipejufuregu.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/mqk3f8o3tqld08qikovepmidp6/29589114616.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/nokoxagowefarixemuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=first+year+teacher+quitting+mid+yearPDF 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_off0001f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F695 17736 bytes
SHA-256: e3a11e66ba4b1e8e65c54e8c3588ea7cdce14bfe30ce95531320f8b24a1df1de
font_01_sfnt_off00022511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22511 10988 bytes
SHA-256: 2664c5217b12bc3671ae8db52b9e65c8ebb6b02acdba2bd295c7fbbf4d711091
font_02_sfnt_off00023deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23DEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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