Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f5125dea3cd364…

MALICIOUS

PDF

72.7 KB Created: 2021-09-26 16:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 884122c5500fcd4792fd189db9f9432f SHA-1: 65a7c8ce61aeb14da09fcb7f858dd7f3e1a25f96 SHA-256: c4f5125dea3cd364c455e8aba90651b49137bccebbf2cfba613c484824232b33
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains. These links likely serve to redirect users to malicious content or phishing pages, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=trials+frontier+bikes PDF link annotation
    • http://turnyras.lt/Files/file/lonuxirexiw.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/59392224652.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/56884914757.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191118572121.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210904_521DD53B689A35AF.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3f8fb33c5---44735120840.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/94f3228fa0d1e1a0530bd155eb559f1a/58308408771.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137749e64328---lawanatezum.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/b3kaprv78qgvqhv7248lk69bo9/ligiguruzomiwofa.pdfIn PDF document text
    • https://funstore.dialog.org/userfiles/file/23339630855.pdfIn PDF document text
    • http://rurisnet.org/images/file/95553222682.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d4badbd6810605c463fd0973104aa9a/lavupivebibulisumu.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/saromuxofikatawopuzot.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/55863803012.pdfIn PDF document text
    • https://polytex.de/sites/default/files/76435297834.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1614e248da497d---60698643491.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/79024265751.pdfIn PDF document text
    • https://tavio.ru/files/file/54460063897.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/baparuxopajepogemakokuveg.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/15460807251.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/xatekamazogoxaxiw.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/morujar.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/11422409137.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/25382839777.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/jejitejuto.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_off0000b6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E1 18172 bytes
SHA-256: a07e239c3645b651919bcb20d321c2876dcafde09f7cbb902dc0c457bc9a3bc8
font_01_sfnt_off0000e554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6B 10400 bytes
SHA-256: 0a4d88aa4524ac50a6c5be4ba479686643949bfb89c7f23b336d63c32f83d451

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