Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fcc1236634f72dc…

MALICIOUS

PDF

75.3 KB Created: 2021-08-10 02:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4481801cfa8ba635e5eecacc096cd9ee SHA-1: c205138d5d4eaa4ab30da39abbf408634a0031e1 SHA-256: 6fcc1236634f72dc61ce76a4c668e14a0c746df38336165ffc288b252e7a23e1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://travellerisland.com/files/jutidopuwozaxutozi.pdf In PDF document text
    • http://aihyang.com/userfiles/file/kikonedezinudol.pdfIn PDF document text
    • http://bienbao.net/uploads/files/6657147136.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec41d97b76c---89303532891.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8eddc1732---panimejusopulo.pdfIn PDF document text
    • https://ecoretras.com/file/57446973195.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c113d54741a---49430419815.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/jabot.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/c34ee369c6d771ccb9e12e8819c16019/85669096346.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ea8fba9e4---55539751584.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/9388487705.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090416a5edf7---rejijevewi.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/91540559386.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/7bff1631f816c4243e752a2c46a4966c/lixozujalup.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/watiw.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7e42c8c02---saguwesotexaxijin.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/27578289469.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079901e8c4d6---vadukugagefad.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/kiwov.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/77409790973.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/118f1d954e6ae78d3b4f4df404fee5b8/tofeduwutomof.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b575226cc89---dosulid.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202108072351246181.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/dubewifipamoxadarik.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/83a64858004214f3cb3dec9e86775263/zaboliwube.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/86015479194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=new+headway+intermediate+fourth+edition+student%27s+book+answer+key+pdfPDF 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_off0000c452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC69 11260 bytes
SHA-256: 62ac27a10d743dded4c2969a80ce1d9c44e19c9a1ae2d5f4a8b6f1ec1476fc1a
font_02_sfnt_off0000f689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF689 15692 bytes
SHA-256: 8325b375c4df0a5206fdc7702eaf133c6b0f6f43ff04a408a132ad997fd3a540

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