Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9e4f31ce526b1c…

MALICIOUS

PDF

88.7 KB Created: 2021-08-28 22:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ae369c3374a6636ecb2a33b7f22b2d39 SHA-1: a0abc939b6f2ae6fd1c13abbea078df30b81e16c SHA-256: 5c9e4f31ce526b1cd1080026199e06907acd94d317035b1af3ae43cbcfa373d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of a link farm pointing to numerous distinct hosts, many of which appear to be compromised or disposable, further supports a phishing or malware distribution scheme. The embedded URLs suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://0-50.ru/userfiles/file/bobodutenimanunobobokifa.pdf In PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/9877348662.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/tiwilaxodefuzutuwu.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/wuvuvuwumuvadop.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16074a3e1c32de---49605995631.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfca621c5ba---95176190718.pdfIn PDF document text
    • https://paperland.bg/uploads/file/noxagitikax.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/mezetesiz.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/doraxovenadita.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/et7a2ttkq0fihcfp0h523tcq25/12976604862.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16118d7ec65480---15099927259.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/97974366181.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/36249242700.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe4b2a61b1---83952420052.pdfIn PDF document text
    • http://jessicarossitto.com/clients/7/7c/7c16b8c799dae9ffcd1258f31d6ff645/File/21218800381.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/sojumokozokewagezoxijo.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/62983481473.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/xibivetudavumap.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e020f164e5---44263374997.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/12221905545.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/66068008492.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/79184086888.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/nudigifufabironiri.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/65225478854.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/fixagetarirerimifigewedi.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/90322409032.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/imd2t96lca58ce8m6vqlse9vj1/24584252134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=baby+dont+hurt+mePDF 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_off0000f465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7C 10612 bytes
SHA-256: bc7010bada0f9a02f15a5abc15cac11a461b137530ef5724742ebfcd8a82587b
font_02_sfnt_off00012492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12492 18580 bytes
SHA-256: b264fa18d5dabd93c4929e7971c5bae15ed307a76cd441bf96e3ec31694c0ee3

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