Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4540e8bf06ec75e…

MALICIOUS

PDF

84.5 KB Created: 2021-09-14 06:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 20fcc7e4faddd55275105fb3b33b1d12 SHA-1: 163318626b4786dd12fe0465565dc1ba28455c95 SHA-256: c4540e8bf06ec75edad6352cb3953d0ababb8b6e242d706642d99a44703a12a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a malicious intent to redirect users to harmful content. The embedded JavaScript likely facilitates this redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://annabarons.lv/files/files/mixizizixunetaro.pdf In PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359467ddd68---xevawog.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16132fd3247d95---30691106451.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/xugedukif.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/68667999235.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/59034237569.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/92676754931.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/sokotutakumivumipodosu.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/xisefajaxozo.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109052148075834.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/resonabemuxajol.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/18360736816.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/gafelisokusulapo.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131260c592bf---movekujolax.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/8405594848.pdfIn PDF document text
    • http://cartopack.be/Images/file/98728767534.pdfIn PDF document text
    • https://istanajp.net/contents/files/bogatumazevasiloxijexajem.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/86981386416.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/8f2b0b95049b343116fceaee297119df/59476808559.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/81980864128.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/95030439118.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/2436025226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=android+phone+processor+rankingPDF link annotation
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/zesukuzubilosogewo.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_off0000e65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6D 17620 bytes
SHA-256: 758307239ea393848415ba9a47fcdb73c787f7867239041aa77530d467593666
font_02_sfnt_off00012c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C79 10724 bytes
SHA-256: 3eae4fe7d40c2955487f87018d2a6105336bb0d0997f0d75f76c5e7430d8c9af

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