Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3cb51322d58805d…

MALICIOUS

PDF

71.1 KB Created: 2021-09-24 00:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c18150eb0979696e206e982aa05be514 SHA-1: d3da6c50d353319360f19ab3a1178835acc1abb6 SHA-256: a3cb51322d58805dd5b1c224b1bec8f59935b4c9818753a89460dd04139b1369
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The file also exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress upload directories and other potentially malicious sites. ClamAV detection and ML classification strongly indicate malicious intent, likely to lure users to these sites for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614168799b5b3---sarizilapumezilajejoli.pdf In PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/sogorosabipazafu.pdfIn PDF document text
    • https://ziyang100.com/userfiles/file/art_16323500797079.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210904_7DBB8463348232FB.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da497b47fd---nugofesabitef.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/vaborelubofasutagamisunep.pdfIn PDF document text
    • http://abworder.com/uploads/files/72482739563.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/94632633574.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f0a3bf608b5162b73312a457d7b3b74f/lojujebogexaxufo.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/girokogudese.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/c716e2ecc2af75222c71a5480d2c540d/mozurefejupiviz.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/mbfbq0uodjkrdvr09jj9sfokmb/50826218507.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/dotifuw.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b75b37a403---gesik.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/52261817430.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614086d767905---9345493018.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/46235684355.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/12989089383.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210905145922.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9feadd302---narejezudise.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/junubejab.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/jegala.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/xajobidukoxijajanavexevez.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/40661182645.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/51380af50afb1c1353ccd862c1612213/duwof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+to+write+when+sending+resume+by+emailPDF 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_off0000b7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCC 14808 bytes
SHA-256: 3fb7cf4e979ad14ce9eef330ec5974ddf85f2070cb60d2e17ad5116c6fe973ec
font_02_sfnt_off0000f4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E6 11128 bytes
SHA-256: 3154d8c0059bf82c724bd8e4f9115be5fb328f8c78d9ef979f44de560468f542

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