Malicious PDF — malware analysis report

Static analysis result for SHA-256 c484861cb306b899…

MALICIOUS

PDF

70.5 KB Created: 2021-10-02 12:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d8579cb570776a59a94558a453aeaa37 SHA-1: b3ca5f29fbd1b50dc1cf8b0cb1941efad642ab8d SHA-256: c484861cb306b8996c87402bb9446e180d2a9a658e65514f0de1cf7f741b6b04
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites or disposable domains. The embedded URLs suggest an attempt to trick users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=watch+dogs+download+android PDF link annotation
    • https://aymexco.eu/ckfinder/userfiles/files/42896330833.pdfIn PDF document text
    • http://schokobrunnen.com/idata/27332634277.pdfIn PDF document text
    • http://szhlfz.net/upload/91270158315.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614858642a83a---81844804211.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/xozutobamalugoziripa.pdfIn PDF document text
    • http://medica-brno.com/files/28030854066.pdfIn PDF document text
    • http://pilatesmystyle.com/userfiles/files/98141167647.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7e8b1c5d9---91682418827.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/petivibepuluzarox.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1632825894.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/zajazejejuzonegekuret.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/gefusefis.pdfIn PDF document text
    • http://contelex.it/userfiles/files/mowurikesudumozipevav.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/a4a43c0bbff6753c5dfdac3956381521/27303653867.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/nulexenifoxewaxogan.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/8135880406.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/teselovuxenepidirire.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/vebimirod.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/perogovu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342a5b912e7---vadibemolosi.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/luvumigarepigokurojuw.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/xafumemefi.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/63822347083.pdfIn PDF document text
    • http://progetec.org/userfiles/files/34170277167.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/kavurulugik.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/22325126328.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_off0000b35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB71 10596 bytes
SHA-256: 4b17be3e6b59e6c379538d87039daec993c23bc3d0786aaddbd9935ea078ca48
font_02_sfnt_off0000e36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36E 16160 bytes
SHA-256: 9a9d427ee622cef5a04809cb40eade5db9c68b7ac10b96a54c6c87f4f7317a5d

Open this report in the interactive analyzer, or submit your own file for analysis.