Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3391ca9b7cba21a…

MALICIOUS

PDF

182.2 KB Created: 2021-07-09 00:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6d3b6e7aa4108fe079829e78c61454b SHA-1: fd1f9938467c2a78e4db05f32df0e81a711594b8 SHA-256: e3391ca9b7cba21a8411e4601a00bb6c892acb73d584f4b8330432405f082b83
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of multiple links pointing to compromised WordPress upload directories and disposable hosting suggests a link farm designed to distribute malware or host phishing content. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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 https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a825e915866---rikuz.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d1eae6512---19871774492.pdf
    • http://steakclubhn.com/campannas/file/73771882879.pdf
    • http://charivne.info/images/file/wufugoneboximiximaletalap.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/8de4099b0c410e87d423459851c7e182/79685043801.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d82c07f30---fapabufejonalepukuruv.pdf
    • http://tsutae-f.com/js/upload/files/74905578772.pdf
    • http://pr-jam.com/ckfinder/userfiles/files/zunowavopupimisozak.pdf
    • http://jjinline.org/file_upload/file/29792667635.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3f548998e---tanifewet.pdf
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49486174928.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc62b8b4bb---96844803093.pdf
    • http://stlnsk.ru/uploads/file/xoviwomej.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096622691d56---jixogizizodobozik.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c79c8f39971---58828741185.pdf
    • http://dakmoto.cz/obrazky/file/wemowovogolulereke.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1ce49f83d---3619183428.pdf
    • https://goldenapp.net/file/39025235092.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2himo83ikctoaiqghu5pi05jf6/fanumisivagutip.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/57bc7928e2e91fda10df756fe08b79b3/17148415208.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=go+back+into
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0002abfb.bin
fcfe51bf641441eb57930507ceb1505f8608562584d20e48d46229fffce00413
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2ABFB 19144 bytes
font_00_sfnt_off00024ec7.bin
10f56804436a9d3d0295a70c2e56dce44426023b7f7a8db83d0db798d9ff3975
pdf-font-stream PDF embedded font (sfnt) at offset 0x24EC7 17924 bytes
font_01_sfnt_off00027d67.bin
3710d6483607aad77bac2605d17f812db9fd4bc751c3b90e9265e124de0db2b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x27D67 10048 bytes
font_02_sfnt_off000293ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x293EA 16792 bytes