Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad279e366ebeec56…

MALICIOUS

PDF

104.3 KB Created: 2021-06-14 23:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 453fdc87d5f0926476ae6687062d4816 SHA-1: 4ffba8a104941e729f85c53ac07bbd536ec3d607 SHA-256: ad279e366ebeec565489a13596eee4350647e66b19b176646879ba295614e925
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document presents a fake CAPTCHA, a common lure to trick users into executing further malicious actions. Numerous URLs pointing to compromised WordPress sites and disposable hosting were extracted, suggesting a link farm designed to distribute the malicious PDF or redirect users to further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://infrive.ru/uplcv?utm_term=the+best+hit+tagalog+dubbed PDF link annotation
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095dabf033e8---renoxavowar.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f99068fca---legolowivedada.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/48342793038.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/be4084534fcaf60e279325b7e7b5ecba/xiditikuso.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cb6e615e0---gofafokigalupumisuka.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079455c922b1---42787518092.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/057cec7c21c2308e603a8c335d86d5ac/xobavirufozolu.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba84b33cdd5---40862377490.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/401a4c485d3ac41b7bafa3656aef0f54/nowona.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/81751219344.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/funulibevijidaxudezowoxe.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b8ef15562---94614312023.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a725e4c16a4---48320196913.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/15792923416.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a0645b87f---deloxozo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001183b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183B 7844 bytes
SHA-256: 7cf7705b785412e64909c6fa53c56454bb39301f855664d9d20898f6284edbb9
font_01_sfnt_off00012ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA3 4948 bytes
SHA-256: 6eb4bd08092ca7834069b44bfbb4399decedad1ec83b4db1000bc6551ac4eba4
font_02_sfnt_off00013d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1E 5080 bytes
SHA-256: 9d45851d16a5970a1fc45e5828ebcbe8e0da40430b71a904451751d445952c1c
font_03_sfnt_off00014e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E5D 12252 bytes
SHA-256: 7a075f012cb2861b3b4dc54506c73876b500453f52bff6148d37eb03f2187369
font_04_sfnt_off00017796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17796 18224 bytes
SHA-256: 6803e8ae4827df24e2f5341b96ae15d181fde84d4cd3f31ee7f86ae68adc3831

Open this report in the interactive analyzer, or submit your own file for analysis.