Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5db894993c8acbf…

MALICIOUS

PDF

73.3 KB Created: 2021-09-12 14:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d31b01fc639030e4d5d644a290c08da4 SHA-1: 0f593ff605ce6fa0356d1cf9a5f01c39448c35ae SHA-256: a5db894993c8acbfc7747e554bd22744a88b59f1929d0b4e1ebc77031d49f5b8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to potentially compromised websites or disposable hosting, suggesting it functions as a link farm. The presence of PDF_URI_IP_LITERAL and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the malicious nature by indicating direct IP usage and compromised CMS uploads. No scripts were extracted, but the document's structure and embedded links are designed to redirect users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://exim5.hu/_user/file/97297289720.pdf In PDF document text
    • http://gintaras.cz/userfiles/file/35634822663.pdfIn PDF document text
    • http://01host.ru/userfiles/files/dabut.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138bf0ece002---rakuvumapoluwogofepisiwi.pdfIn PDF document text
    • http://dasbluemchen.com/lowarizeloxigeli.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/81215254165.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d39e44dfdb---rudulewafujivozoxe.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/16444765286.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/57454397992.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/81130221109.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/46216643639.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389ed2b9d73---zusajiranobeza.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/ludiroruxigonufugitawaso.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/96995206520.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/mowobujiwoxilo.pdfPDF link annotation
    • https://onutglen.com/caningest/images/file/76099942495.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/medik.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/lumazejusofusifewok.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/dc4a3c795b1ee931ae7ba6fa2247c751/95496321116.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/43783517475.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/30942128647.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210907113055.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/47515247615.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/64219533927.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/5324933874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=office+365+incoming+and+outgoing+mail+serverPDF 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_off0000b821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB821 11484 bytes
SHA-256: 7e4b2e22c45c6590fd450d3023e1f4d013f7d6c9af9b48d16ed687512890b9f4
font_01_sfnt_off0000d329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3B 17060 bytes
SHA-256: f437e26c1030e600f2c34fbb2ea5015f62f87cf76842a68c4f1bf6b37291c5b5

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