Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee260d7092531e5…

MALICIOUS

PDF

86.9 KB Created: 2021-09-04 15:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 137638f2d3653a9bac588c0882adcebf SHA-1: 840d002f79513a590551b3cadd4a2f9e6d709c19 SHA-256: dee260d7092531e5f27f4657e342ade2c2a68d9236345b7c3e88cb8b966b3d46
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The PDF contains embedded JavaScript and a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting. The embedded JavaScript likely facilitates the download and execution of a second-stage payload, while the link farm serves to obscure the ultimate destination and evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://joltiy.ru/uploads/files/daked.pdf In PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021071711194173499.pdfIn PDF document text
    • https://www.gcnaura.in/images/uploads/files/17622044296.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/87224950238.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754fc700722---18611357134.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/24431692619.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/faxej.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/34bc8276884c633a0a2786396925b4a6/pejomavidekejutavag.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b611f97cd1c---38706681325.pdfIn PDF document text
    • http://budka39.ru/files/gewotujigixuxinagum.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/27872555279.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/73896739629.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/96943415816.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/961b38cbb6b8014d0edd443a77c251c4/kazogu.pdfIn PDF document text
    • http://ruihuitax.com/files/file/46647661384.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71043708336.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/36911291945.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/josasixekaburafiv.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/mumesanekaxepafud.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/22292012531.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/2133538603.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/74853bec61f32d28ac84c0ee13d3f247/ditez.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/36552294761.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ba4051476c---difitiwapanesigezipujagin.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/37545475235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=drdo+question+paper+pdf+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9C 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000e598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAA 20760 bytes
SHA-256: dab0b190177a82e38631bcb59a030121e09ef03134a0c4948688805782dd80af
font_03_sfnt_off000134b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B6 10824 bytes
SHA-256: db04abdae07c591e299d877b34394b22532e28cae21f705e46879ed6470357a2

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