Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81ceb12d08f6b91…

MALICIOUS

PDF

84.2 KB Created: 2021-09-13 12:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 736398e967108bb93125e465cf96ecf3 SHA-1: 096d6afc7e0118b48c5ffbcc1048bb3341449e38 SHA-256: d81ceb12d08f6b9165b19fc64cb8c4c5ec67ee2edb66e7f3e26d88a1c6c32e9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, indicated by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the structure and URL patterns are typical of phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://uchid.com/uploads/file/21271525964.pdf In PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328e32e099b---pojuputebewuvozawo.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/63205475056.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/88425548563.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf943f602---36128373123.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/varesuvisudurupu.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/wijelizulelotajawaru.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/zawuzis.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/jekugiregorenirajubejir.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/68841318779.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/43236622468.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/noxelute.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/17965052826135b39aa8e23.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/xutalekizen.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/68651115258.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/17054189682.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/zidow.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/vovewekobedelizedujunoz.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/zezojusodovimize.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/forilamexepodumixofa.pdfIn PDF document text
    • https://webmenuplus.com/images/file/joxuj.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/8p14l8buir3t9rsrm2f8befrki/65139631711.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/78809281947.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/mafupujukoduva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=enable+on+screen+navigation+keys+on+androidPDF 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_off0000e1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA00 10940 bytes
SHA-256: f04a20949a83ee46c4be136cd81b4a30e88218be8e87bf55b60fe9367b5b1ac8
font_02_sfnt_off00011355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11355 18112 bytes
SHA-256: 04f4b1267dffa314d12b5a61dad471731869f2dacc15bba39c3030ef1b00bc1f

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