Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e3851ce762ef84…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 13:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a65733a7f124facce3918bcdd5cc6937 SHA-1: d7e73da73c6bb307c4ae4171a94da6087d0312e6 SHA-256: c8e3851ce762ef84abb29f58ad604fc108ddac7eeed3f1853e5e191f255f8de0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f74d58f776---dixoxonekatuzob.pdf In PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba521c326d8---suwoborev.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/3f4a8de66e2d03506c5eed2223515525/zevepipuze.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/66582469807.pdfIn PDF document text
    • https://aitalk.vn/upload/files/25557120893.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/3e033454af8d0e3fbf39359b3a3311c6/98764849435.pdfIn PDF document text
    • http://hillandbrownfamily.com/clients/76964/File/98649738146.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/gekogamilux.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/71451820187.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/fa0b83e447931e017e7a25d9b0d9cf8e/72944309802.pdfIn PDF document text
    • https://le27.fr/docs/file/42705516079.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/5cd72e462571ed6502ea334c6eb90483/zapobaxukixid.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1626095309.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/5260676039.pdfIn PDF document text
    • http://oembag.com/uploads/files/202108201423012805.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/fisen.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/jaxabigikegabujadazat.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/gazuval.pdfIn PDF document text
    • http://amandamaitland.com/images/file/xuxivogupapanu.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/58193419008.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072560f6e02c---tejupudator.pdfIn PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/69018356694.pdfIn PDF document text
    • https://profm.hu/files/file/dolilonuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=differentiator+amplifier+pdfPDF 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_off0000d7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 10492 bytes
SHA-256: 5fd56f61c8a5acdc13948157c1607ff365532fc9e2112bb8f3fda1bec472b190
font_02_sfnt_off000107b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 18128 bytes
SHA-256: f1fd946bd659cdce691b0c26f5b8b08ff06da994f89123126359a0fed8e9acc6

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