Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab42e68c688aac8…

MALICIOUS

PDF

78.6 KB Created: 2021-09-09 06:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 30eaaa89dd1e68690a10b4070a3fa89f SHA-1: a27ed6edf84aba27b43cd6d24c49ef9d987a9a43 SHA-256: 6ab42e68c688aac88a3c1d8762d40252cde576ae2ed3fdc0f589d2179206d44f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The document contains a link farm pointing to numerous URLs, many hosted on compromised or disposable domains, suggesting an attempt to distribute phishing content or redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest potential exploitation or redirection mechanisms.

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 http://garderoba.sk/images/_file/64069778935.pdf In PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330c4973188---54457340667.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/90771024446.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/supifop.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/befafujorivitugawakixeluk.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631137767.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/bb72de570f7d4bc56ad8eabfa630078f/xelotodom.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/zipekepibufav.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210908013138752.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/32835057924.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ntt03757t7i38iqvmc2glqdat1/naratevelalotufififi.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/sakekebuditeke.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/4190aa51a26d70f2946a925dda66db28/lutexex.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/xuruzomob.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/73068227832.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/84752976781.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/wajumibomazivij.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/lizimir.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/079d5f081ba6614eddc7d2df4a8fe7f4/rowun.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/78530789152.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/4742110803.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85185407705.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/47358614235.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/27233429179.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/vekowawafuxorelekub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=onedrive+login+ukPDF 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_off0000cf43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF43 17940 bytes
SHA-256: 1a76ff4764c53c258605195809c39daa082b505572d317e79aca81dd5d5c3948
font_01_sfnt_off0000fde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE7 10280 bytes
SHA-256: c846d71bbd4347af912d3f3db1b59129e2994194e01582bd9035891870c2f129
font_02_sfnt_off000114ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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