Malicious PDF — malware analysis report

Static analysis result for SHA-256 1287331b0e238c7d…

MALICIOUS

PDF

89.1 KB Created: 2021-09-13 16:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 56e9ba51779256e5d81d173d3c8db5c1 SHA-1: d88b38065959b2dbc6359ac6a6b167d12ff38857 SHA-256: 1287331b0e238c7d32a59d2c4946064ff6df3247c07e30468eab2d007edcffae
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that direct users to various websites. Some of these links point to compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://hantverksakuten.se/ckfinder/userfiles/files/wupun.pdf In PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e984f34746---54903366907.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/dunirugidopusemidigok.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/83865094064.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/e3m9c0k311dfi3urphnoc3rbr2/51410725625.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/73300117460.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/96443461325.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/favewabax.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/58840366230.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ta6739fa5g4g0lobl827bgfu2u/rirowedotizuxariludalexa.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/8b081a363895e08e9b0fd6135bdb5888/24243209577.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/53040034258.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/48b02aae9dfd6c1b0cf38a7a5d6f42af/68309420122.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090412290848.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/bigivizinekitape.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/xoniv.pdfIn PDF document text
    • https://506hlapeta.com/files/file/29906283767.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/34721792243.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/67284958862.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/potimiwu.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/katejojavekopidumut.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210913164229_NDgxNzY5MTA4MTU=.pdfIn PDF document text
    • http://chenruichem.com/upload/files/susazuvuz.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/26457660083.pdfIn PDF document text
    • http://m2m2design.com/userfiles/88461243628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=nokia+1100+android+release+datePDF 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_off0000f557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 10484 bytes
SHA-256: 2488a74d78d01afc19ca705ad176ef11304f364e9e612ed18901df321730f158
font_01_sfnt_off00010d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D53 18804 bytes
SHA-256: fff87348411de7ca1a8325869b54afc14195ed1215f12adbfd47563ee38cbbc7
font_02_sfnt_off00013e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1