Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d090168054ad74…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 01:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 86d17b3c10f385bfcb28a2b71983008b SHA-1: d79157fd289ff68f876367a164192d6aea39e127 SHA-256: f2d090168054ad747b82d55389ca1a44c1350f3e88f9802852e639cbf29ac688
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which are flagged as potentially compromised. The presence of multiple PDF link farm heuristics suggests an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://amursvoidom.ru/media/files/jepojomev.pdf In PDF document text
    • http://keramann.ru/uploads/files/mexoxexufomurosazox.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/kanesiwos.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/fafaxiw.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/nifujir.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/kewexibuziwex.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/voxitomibivov.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc82e087d6---teruxekipuvize.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/gomupo.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/66049257418.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/roxutivezatejimebawesi.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/gezapenujobufaribotizi.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fce986e138---30516346755.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/katemetexizudawoketo.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613194e742605---nakerisuvalovon.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/kegaxelej.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/26194420301.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/14529121469.pdfIn PDF document text
    • http://idcla.net/upload/files/detibozixotoz.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/98857035887.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/nezutamufupesexifesa.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/03/18945182831.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/39490900608.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/fuxaz.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/bevum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=refraction+of+light+class+10+ssc+notesPDF 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_off0000af6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6C 15676 bytes
SHA-256: 2e2d65f5178ead6f92f863d9fa02c3c8be7cb41647653172bbe9dd3c17ae9bf8
font_01_sfnt_off0000d71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71C 10836 bytes
SHA-256: c37609d474847b4c64d82d83f7211b0072f277dddd2d31d0eceee9d03f13466b
font_02_sfnt_off0000f01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1