Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6a544fa615f534…

MALICIOUS

PDF

75.5 KB Created: 2021-09-17 12:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 195e31c339c2da4a3731ca17bcefecd9 SHA-1: c4cb7febeab07d527403915c9d4a6b946db78f84 SHA-256: 5b6a544fa615f5344dc14a9ed8e6c9b3ba10138c6b1543ea8a4ebf2822462c70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. While no scripts were extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=sn+ghoshal+quantum+mechanics PDF link annotation
    • https://ht-cooling-j3t.com/contents/files/lugegilefefur.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/wifuxafetobovazepa.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/werukezogamuretix.pdfIn PDF document text
    • http://kgmda.com/upload/files/62752011306.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161419c3b6ff2c---tolewadoxalof.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/16917572310.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210907105050.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d335b1b35---56261562599.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/kejowo.pdfIn PDF document text
    • https://autoskola-scp.com/files/ponogavixamujadizomaz.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4f1c107ff---zoniviguvetimuziwojori.pdfIn PDF document text
    • http://classtool.info/upload/files/94536746516.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e62dcdd5a---88551802843.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/viselugawoxaxinekoxarez.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090818283973499.pdfIn PDF document text
    • http://newo.ru/files/files/59248561503.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/dunelunarujudemojetufofo.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/rovasosuvipefatudiket.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/87768901503.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/fugaledenimituxoke.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400d84edf27---28357423552.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/489706420.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/81667655491.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_off0000c274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC274 17364 bytes
SHA-256: ca42721e499388e8a5da016d94bcfba508088ecb3c2a4718c21d661c3324ef16
font_01_sfnt_off0000ef8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A2 10896 bytes
SHA-256: 0a73cd98823816888aa24220004db042f2c4a37bdfec6a72d0bc72292145226e

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