Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d04d4b4b09fae2…

MALICIOUS

PDF

97.3 KB Created: 2021-09-06 10:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a6ad0cd04a2578424336bcfce0edcf9d SHA-1: 3c5985e3a8112224f2762c1fd3ad53294a3f7049 SHA-256: 25d04d4b4b09fae2db442acf0ec6590d0f6471613b218d6aabdac41ec240dae5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=modele+fiche+de+paie+vierge+pdf+gratuit PDF link annotation
    • http://www.firengo.com/userfiles/files/mifixojubujilevokovet.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/dexifezuver.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/d545ceeb385de125e54b9a44c4ddb8dd/rixedubajobotosasuwurawi.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607673826f3e6---73322289767.pdfIn PDF document text
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/82036172194.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210529090525.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210708064410.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/2961700788.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/lizukanutapobelusalov.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/5dtraqsu3t5psssbqpseskpegr/39059819274.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/xufofuzo.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/79870711422.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/53995436456.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/69619696303.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/62311310154.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/tarudamemufale.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/89058834249.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/61952173568.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/fe865b5af09bde85b188eb1608c6c86c/xofirogoran.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/t714fq8ck818qq3ken1dt6k8f4/jozamojilowoxawaxugizon.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/detivalunafoloruz.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0730286072bbb3f52ee31476be42bb8f/nutalodizada.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/51411162009.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/notutopo.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_off000111e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E2 10788 bytes
SHA-256: 7610845f3e5b0cc2efae99ddae30ce1657a0992750965d92e2c603391ed67631
font_01_sfnt_off00012aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA9 20504 bytes
SHA-256: 39ed4d4730c75cb839b8f623195d197578c9cec5ea467b6226c1f396a24421a7
font_02_sfnt_off00015f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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