Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6700d52c0d8e09…

MALICIOUS

PDF

85.6 KB Created: 2021-09-01 11:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 64bc6f9d4ff7e0f5a6224039c5d78097 SHA-1: 5c43076aae6a31c5c2fe0b1c6a78ee16a1f432f3 SHA-256: 0f6700d52c0d8e090dd9972edbd2644fc2fb37c9a00d060f94bfcfd9fdea8d70
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160814c6a08f8b---pajazaluwegozi.pdf In PDF document text
    • https://pmms-online.com/assets/file/56354971845.pdfIn PDF document text
    • https://coluer.ir/documents/file/rebologariziposuramazipi.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/giwagizog.pdfIn PDF document text
    • http://amouage-salon.ru/admin/ckfinder/userfiles/files/sabojegodekerawuviredeki.pdfIn PDF document text
    • http://naturallymine-chicago.com/clients/867610/File/93804341601.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/fudumupa.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/61715867967.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/jilakavitafesepeloxesox.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/13107457775.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/o97bmfd91dlqu5sbaj7emu6o85/wilaxojuwajabonile.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16254335843911.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bf6038dfa---majoz.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/80078652694.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/ponukonopobixunejodifova.pdfIn PDF document text
    • https://samowar.ch/upload/file/natusi.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/a021a137337d7576c3ef27b2bd97b668/rewogivefaxoxejez.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b355bea939---1007914395.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/77d86de16c83daae78a5ab43107f1375/korodileli.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/16866962999.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/3d6a776add7d199dfcc29c1b42f1a51f/nelasisup.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/1f65eddf29ffcb0b5239314df0e78546/7832280543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=clash+of+clans+hacking+game+downloadPDF 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_off0000ea59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA59 10936 bytes
SHA-256: 7d58b042e3108f33085d368c1c0326ac30b07480c229a44af2e246ccec263de2
font_01_sfnt_off0001035e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035E 17368 bytes
SHA-256: b690ff4cc288c616db789a6c9f7e520cb77f03820c796c4d9cfd363c447e5d78
font_02_sfnt_off0001305d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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