Malicious PDF — malware analysis report

Static analysis result for SHA-256 813bd15b0875a137…

MALICIOUS

PDF

71.4 KB Created: 2021-10-06 06:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 14615d7385be4ad5c460579852a6a32c SHA-1: 93411e99ccd05318f87d46562998847a0792f29b SHA-256: 813bd15b0875a1373d97ec46b2ee661411e4b4feb95db29209b393c59b0829ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF contains embedded JavaScript and a large number of links pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic firings indicate this is likely a link farm used for SEO poisoning or phishing, with ClamAV detecting it as a phishing trojan. The embedded JavaScript may be used to further obfuscate the malicious links or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 https://pixomot.ru/uplcv?utm_term=find+projection+of+point+on+line PDF link annotation
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/7km3cl5bjblglohr1rp3s6it6c/mukumiganisosobofusik.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b0ebc8bd3---35285030446.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/42445649363.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/39183852434.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/ruzomudonubitujuzamifawo.pdfIn PDF document text
    • https://alibaba-cave.com/userfiles/file/deviginotarusewipovexi.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/rirofoporetosop.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/rsa8v7dgv8bu8oabqbcmbq93hs/62223627044.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/68035384983.pdfIn PDF document text
    • http://www.pvvc.cz/files/femawoxogasasobozofotemu.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd4296210e---rasuxifuxevapawufisoler.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c645ca3b59---88508788762.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/kejugixerafilewefimivas.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/fejufapajomirepenix.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/zagexeborolaxonav.pdfIn PDF document text
    • http://hzbaoyan.com/images/upload/File/1030849594.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210906003547.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/gegepoxipazebizatot.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/17558826005.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/xekogo.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/48798216303.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/28665603921.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/55430015157.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/boxipixisebulajokale.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/jajupawiligakotavisema.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/83151506322.pdfIn PDF document text
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/fevajuvopabizis.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_off0000b8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E7 10388 bytes
SHA-256: 2c317005708af58b44efabe084c38b2373694d756d69be12769b26a6a5983028
font_01_sfnt_off0000d065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE877 15512 bytes
SHA-256: eea74c288283156971e6b38e4dffa240e94ebadbf4a5f8fbfb726a86196eb3de

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