Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5ca57ce28c6ab6…

MALICIOUS

PDF

86.6 KB Created: 2021-09-18 05:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4768b09fc6c5852763ca5646bae88889 SHA-1: f89281e12e6c21173f9254efdc4de238ae256d4f SHA-256: cf5ca57ce28c6ab6bfce7409e0019a080071d6979e1f3560c743bf771c2a7251
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple unknown URLs hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://arc-en-cielproduce.com/ckfinder/userfiles/files/pilodosimox.pdf In PDF document text
    • http://denkobarbell.com/_upload/files/temiridalopujegu.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/rapagudelamoz.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161413d5babe76---17700457811.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///tagakugiwipu.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/zewajepuritawalaf.pdfIn PDF document text
    • http://tochuchoinghi.org/files/dekonezofado.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210901163805.pdfIn PDF document text
    • http://unsersohn.com/images/file/95692899486.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135172ae3b2f---wegigabogililiraja.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/puxadugeb.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/tipafigesozalo.pdfIn PDF document text
    • https://artenika.pl/fck/file/25117302897.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/43875005551.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/75739842738.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/wanewivevinakegatalug.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9558586089.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/802768c35d48241c8bb0dacd87e0d796/parixim.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/84285341738.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/22d194a918bdc358e5755782865c402a/97982603947.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/bupajukesuri.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/91567541848.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/megeposibokik.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/59040376294.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac91e3881e---falosuruxokajosidosub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ps2+pro+emulator+for+androidPDF 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_off0000ea76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA76 10880 bytes
SHA-256: 63c7b461adf17691bc4aa09b8ebab304d2e24e4ea9e7baa1c1fca8d484dc692b
font_01_sfnt_off000103aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AA 19000 bytes
SHA-256: 8264f1c285f31c2f05ff1a6057116d1883fdc9e4846af34f49cde40832e43fe1
font_02_sfnt_off0001349b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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