Malicious PDF — malware analysis report

Static analysis result for SHA-256 6986a2c8bd643b8d…

MALICIOUS

PDF

84.9 KB Created: 2021-08-13 20:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e62adf40fc96713da93c9a6110340b9a SHA-1: 91e871485856183998e15079da1ada5191bfb8af SHA-256: 6986a2c8bd643b8d79ee4199ca0894b4c8bea6a60511b6b01121973825f7f5d4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs are hosted on compromised CMS platforms, suggesting an attempt to leverage these sites for malicious redirection or phishing. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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 http://langmypham.com/luutru/files/74276716481.pdf In PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mapixuduzalukelomoxaguje.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/zuludovag.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/8f82463e40c74957d5bc0bfbf3421487/teroruxuladufi.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/20086577937.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ug69f28q6osf14ac3sa5pqrbdt/kubegotowiw.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/sl1tvki1etpbvri9emn912e4ak/mobokasamunaf.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/rgi6fnkkgq8lgl0g337aaghprq/sijuwi.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/b98dfbd947b48716813401d8a776d967/sulutalajugoxiwimufuzom.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/5066824049.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/98885168507.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/59555520826.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/tmetk7d972j431em2ch91n8ge0/kovusoxerududokiv.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/7699525897.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/gadakaxo.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/90445011850.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/95p7goqm02ika3ge30bdej6bv7/43060160150.pdfIn PDF document text
    • http://elm3rad.com/file/jojivitog.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/15404119194.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/cf8d942688fb2b59b84ff094c29740a9/96693852935.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b10185ac932---4692792914.pdfIn PDF document text
    • https://www.stavbyhes.cz/ckfinder/userfiles/files/zosul.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/59194011100.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9d7c2acc7---55367228931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=insta+likes+apk+2019PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DF 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_01_sfnt_off0000dfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE3 20348 bytes
SHA-256: 999706faf1fad845e3b0d2ddc45eb297e0455b9daa7c356e6b5aa6cf2a442568
font_02_sfnt_off00011410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11410 10532 bytes
SHA-256: 1e5574f71f16ff2d199aef00cff8e92e9bfa25d3ea50bf84af85e09d81841e7b
font_03_sfnt_off00012c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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