Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9fa2b9eb31050a6…

MALICIOUS

PDF

73.2 KB Created: 2021-08-27 23:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b565c2e9aa5e56bf0ba67663af74287d SHA-1: 8a0a74828b78c2b29811c15d4d5532fce3f4a796 SHA-256: e9fa2b9eb31050a614093a3a7f54ab148f52eb15d91e8a4572a1d303ece49bd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, with numerous URLs pointing to compromised CMS upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure suggests it may leverage embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://fixafilm.se/userfiles/file/legovapejis.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/a5pmnke7e2mvcvu6db0vamedo2/8675709624.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/70548952411.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160811aa0337a2---63396012347.pdfIn PDF document text
    • http://millecolori.it/images/file/nibetukemep.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/nafowigonenamet.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/189907ee65844cf269379d12d2b9052f/64347844970.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/5cc996b97f75f4bf423f43a1daa99d90/11592374460.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/kalegofadunanuguw.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0da40f842---sijezuwobavunozidopi.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cc3cc6c0a---feranugepo.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/sawonesajeve.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/88268544239.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/96578808064.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/0ae16f32280cbfffb65dcc019000f5af/nanafezad.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16092af646ad15---20559011284.pdfIn PDF document text
    • http://terralindahigh1981.com/clients/866868/File/litovutunevolufowesuji.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d2eed76e533---86907918818.pdfIn PDF document text
    • http://patroha.hu/file/dezewemeselopizen.pdfIn PDF document text
    • http://smakbyala.com/ckfinder/userfiles/files/beximegopiw.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/83913816663.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/niravokifomeputevefo.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/wipiwikof.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/devimozot.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/443af790c5c0be4d2b247cca423bcb21/93934010542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=websites+with+good+uxPDF 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_off0000bcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC5 16420 bytes
SHA-256: c29e92d82042e3fc6327d9e356c9da127924a6a65cb931a77516f732e45299a5
font_01_sfnt_off0000e69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69A 10536 bytes
SHA-256: 2ce2789ad2985815fa4e00825562511a647b0b80889828af3d3fc8e23b06d134
font_02_sfnt_off0000fea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1