Malicious PDF — malware analysis report

Static analysis result for SHA-256 da72e301d39079cd…

MALICIOUS

PDF

71.4 KB Created: 2021-09-20 13:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 233f006f53f0238eb1340fb18bd789a7 SHA-1: c0d49ed7a070dd37b889984d0d08393c54aa3dec SHA-256: da72e301d39079cd0238afcfd7a9c47dbdf66cd573d52c2a6bfeacc88d23088b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious payloads. The presence of multiple external URIs, some pointing to compromised CMS upload storage and disposable hosting, further indicates a malicious intent to redirect users to potentially harmful content. ClamAV detection and ML classification strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://w-w.cn/isee/pfm/cms/uploadfile/fck/file/kozogupu.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/5a996549762ddfb35bec75df9b6f4d00/25939751512.pdf
    • http://89928386.com/uploads/files/202109180837519013.pdf
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/surujeraturudofula.pdf
    • https://larioenergy.net/uploads/file/46309503991.pdf
    • http://leadershipcareer.kr/fckeditor/_upload/file/kotiw.pdf
    • http://e-baze.lv/images/site/file/zagojujibugewubosukusab.pdf
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/53540318205.pdf
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210920131544.pdf
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/78649090398.pdf
    • http://inlovehuahin.com/file_media/file_image/file/37476234935.pdf
    • http://logopeda-empatia.pl/content/file/73566728553.pdf
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/vakogop.pdf
    • https://nmg.lv/img/uploads/files/61026210424.pdf
    • http://landonintergroup.com/ckfinder/userfiles/files/juraxafofizesuxoma.pdf
    • https://siroyensao.com/upload/files/98108825980.pdf
    • http://tcihk.com/userfiles/73369759124.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/bunedunapexukozap.pdf
    • http://dieterheich.de/images/uploads/file/wiwapuzepiguwekomazerab.pdf
    • http://vekosgroup.ru/userfiles/file/dugibexetusaperet.pdf
    • https://kristaldicarlo.com/userfiles/file/65519204705.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/9299388945815c2e520c951aaaf39ed0/34399929258.pdf
    • https://listocrm.com/userfiles/files/rodag.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/cdc30f76a97df9efc3b7dce00c3c19bd/46640381294.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pokemon+mod+app
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b691.bin
c714eb2ad910510facf955b5d1280b17c636c3e5dd9ed31eb0f1e5d30d153fc5
pdf-font-stream PDF embedded font (sfnt) at offset 0xB691 10140 bytes
font_01_sfnt_off0000cd2d.bin
f22f961be879ec6653405d2a295d59cbc7ffa96737ba723e8fcfbd2df7819fff
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2D 16984 bytes
font_02_sfnt_off0000f86a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF86A 16792 bytes