Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d2fba63a871b90…

MALICIOUS

PDF

99.2 KB Created: 2021-08-04 06:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b72fa13da476fbe80a8f704978d6d3a6 SHA-1: d57c5feecc979b4c3683bc10fbfe90c22e7a441c SHA-256: f4d2fba63a871b90464bcaa37407669dc6a483f42f5aa0bb6495a6e7281e4bd4
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs pointing to compromised or disposable hosting domains, suggesting it's designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous links on disposable hosting, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://coretry.ru/uplcv?utm_term=after+the+first+death+summary+chapter+1 PDF link annotation
    • http://remobudostol.pl/pliki/24463674989.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/jozumozerono.pdfIn PDF document text
    • http://ahchala.com/img/file/92959478933.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/84797359965.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/88387272602.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/6c15c3e5e20a267e494d5d4b0b188870/19215657632.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/72cde9ed8dafb9c188ef474859511911/jefiwejanemujujagaleladu.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609b10e96f261---11769467223.pdfIn PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/keropiw.pdfIn PDF document text
    • http://netpost.vn/upload/userfiles/files/xawajitojigezotug.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/degizusewipik.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/miwetidujuto.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6ac1a6d85---38734867006.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/86595237489.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/sojagejenebigafavemusi.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/48773096517.pdfIn PDF document text
    • http://teplospectr.ru/images/files/mekusize.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d9ae5872d---77676811151.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/burokiwa.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/3f987413288e761b8737851876fa40bc/98988479863.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/16edbac2b2a52319c8c80cb57a542c6d/81228198154.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/49899579076.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/49933748617.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/2bu5e3p2qb1ldq4baofmcpe221/13107202897.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a9ec0f1fb5c407c44bd2f4935cf0024d/tenepomob.pdfIn 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
    • 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_off000120e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000138fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FE 10864 bytes
SHA-256: 2313dce0c76d9ee2e0b5db1310e327623506dccd1175229f9cffdd9ee124c98b
font_02_sfnt_off00015235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15235 16812 bytes
SHA-256: 430a9d03bb61b57d8c8bf388cab1b76af9832420e0d65f976c0663e5adb1d5b3

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