Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e1d65ed31598db…

MALICIOUS

PDF

91.4 KB Created: 2021-10-10 14:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0575ec9a3ddb64ce51ce0aabc53fdbfa SHA-1: a7927d3409e902de4e28ec89cbab04131cd94fd0 SHA-256: f8e1d65ed31598db1f32ca7b963298798d8368116005b95b99c812acfaee57b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://dnm.tw/uploads/files/202109110115515050.pdf In PDF document text
    • https://camphacement.vn/upload/files/fazola.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/8b15edfd32b54d659af800aebb0c498a/zanesumenaridorab.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/sogeritemazogiwaxu.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/lizikupebujokewugo.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/gedogifufaxus.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210923032858.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210906_124412.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/rukiretewuwuritazori.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/favalijinaxomab.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/57950682413.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/fefasif.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/mulirazetotugalesad.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/jabovoriz.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/1fd9b577a4827fea660c915d48ebcff6/pavenegule.pdfIn PDF document text
    • http://freestyler.cz/img/file/2881371506.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/n6t6aaehdfias631jd9vjmlk66/47969993251.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/xilagevixezalazifakizegep.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fed63f066e---90782369765.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/99133199300.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/livajawexu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/v1rn5aqa0nscmbclcbls718fau/40744716241.pdfIn PDF document text
    • http://feg.vn/uploads/files/nijezemamokuzuwa.pdfIn PDF document text
    • https://palet-school.com/files/files/dagavumeneta.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/21346061492.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16160ee92be71c---kemokunegimilunutojonabod.pdfIn PDF document text
    • https://bak.vn/upload/files/25959760497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+first+book+in+the+old+testamentPDF 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_off0000fad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD8 20384 bytes
SHA-256: 7c38fbdf5873a41fe738b7f7c36420a84cbf17746726f2a0f7bfc8971242d321
font_01_sfnt_off00012e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9E 10816 bytes
SHA-256: 7557a06c35d891cf65c2f339ea97af77367b8ef4aa8b595eb4a80c10a6622935
font_02_sfnt_off00014760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1