Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d5438769aa098b…

MALICIOUS

PDF

87.4 KB Created: 2021-08-06 14:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e85bf9278e8b03afdfbfd783ba219dbb SHA-1: 35d1fb4a18c69ca2eaae6239ce35dd875694200a SHA-256: 44d5438769aa098b130b48c3beedaf9b1d44f9f8d2d4b3298b4aaf025d86b4dd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://charivne.info/images/file/87461770698.pdf In PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/31108696312.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/fafajaruwivefux.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a209105068---31947662651.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb1f5f70f4f---30444433891.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/26idev8tibri6vs4t5d624gfk3/sepuleposunetabe.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/dilopogeresewuzagaju.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/96684370eaf73826e02971d6790b05e8/vufunobapilimu.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/luleguvufopuxezizamuxe.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/71905629162.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/e41988ecbb5700abda43c59b8de79a77/gofupafoganujukokurakim.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb2a596eec---jejogilodaropebikesibuge.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/60823612922.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cafa63500---37860525731.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/10841259124.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/f4c95dcdefbcb8c73ab1af8d86c71eb0/58628420551.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/0djstmaa886mssdldih7641svf/20817179719.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/1324554643.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607066755f7ad---43076472189.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/18095617764.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1kia6fbjit3bcla94lpo7s9d4u/67366476538.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160907305974e9---sigoranidepamizixabel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=manual+fallas+en+refrigerador+general+electric+profilePDF 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_off0000ee1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1A 10888 bytes
SHA-256: 7aa689b36d7296265cc12d9fd8aa68eef69ddda897332a7f42da07b35a8313f3
font_01_sfnt_off0001072e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072E 19312 bytes
SHA-256: 26a71e4629fd8cdea9716cf41129427d201bd1039b23f366eecf1f361ce1c045
font_02_sfnt_off00013700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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