Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e4a4e895583cecf…

MALICIOUS

PDF

89.4 KB Created: 2021-07-05 03:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2cf11cd4766fab26a23a6dc6dc750ff2 SHA-1: dfdde757bb4af2c02dac22d64124211f8cf36e0e SHA-256: 2e4a4e895583cecf7aa39e4bcb143519f3c37b57824e6485917bb7804f747eee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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 https://irlanc.ru/uplcv?utm_term=one+word+to+describe+a+person PDF link annotation
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ebc150abc---vewaxelejaxopenevifupaz.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/xituweget.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/vategexixulesaginex.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160918b4a41d42---88113942046.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/0af71ec9f7a330b4e82121e0a8b448ea/xanimofofupureboxa.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160845f76438e6---43689065375.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/4eabe6f8dc88cf5acbbc7ef810f1ff9f/42182620724.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160987ca0cc5f1---zubojatudufabix.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/donezow.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746e8214758---kijalifodewumobepejivif.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/sobulogiwomulisigobis.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/d633ae60140f53018bb2ea44c5794343/bawexupenupugel.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160816042f2ab5---tubigutosigu.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/joxuxolofaxubusa.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/qmhm6neorb913aipe7q18puqjn/devedelukimimawim.pdfIn PDF document text
    • https://mszukam.pl/dat//file/xizebudolojexiluribesi.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/54900de463b5b85bd395eb7c9b8a5d7b/74233734922.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607eec0b8926f---41324546700.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/62396728938.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b627a08ca0---vokilikefasunusowekekun.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/48853080310.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/60798328157.pdfIn PDF document text
    • http://runo34.ru/attachments/file/nabofedanometasoveve.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/72950661785.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8ab9e8fc7---9869309945.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/d3eea43dd40c28b5f5f62a5588bed43d/18446232124.pdfIn PDF document text
    • 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_off0000f75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 17756 bytes
SHA-256: 7990c4eecfb755af484d08bc94e6c782e339fb2d1addbf03cdc0c7a3e5e2f2e3
font_01_sfnt_off00012614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2B 10712 bytes
SHA-256: 2bc4685064cf13f1fbbbb1c20734b7bf738b1ae39e3b5d8c720b6aa3e19c413b

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