Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad927ae7420db1b9…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 19:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e635d0b7eca6cd1a6d38e78324b5a1c7 SHA-1: c50c42348f502f7e0ea81e8c2dabcd61a0b14778 SHA-256: ad927ae7420db1b9926588158792b809b1de3b38c0986caf63ab12d643fe9d3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The 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 compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL heuristics indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://apra.pl/files/file/kafeko.pdf In PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/d92a10166b1f91f79a120c25b2ecebc0/xezofotutusafi.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/51031788490.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/8915262181.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56312993130.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/67594338247.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/vivaw.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/db7864728a288e0f0ea7cd45c34faf6f/difutewori.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///dugabitodigalekinokewesem.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/jiruf.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/xagimukudejufekaza.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/datutaturimifoma.pdfIn PDF document text
    • https://bliznacite.com/files/97947023097.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/25396858106.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/dejuzajigirefisavirokaf.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/67175474037.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/16306890372.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/gunuwus.pdfIn PDF document text
    • http://farmina.ru/uploads/files/todozedolezaxedalev.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/banuguzi.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1966e3f29---45391676118.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b5e53cd0b---70744994447.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/25286189163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=root+note+10+plus+android+11PDF 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_off0000cd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD95 19356 bytes
SHA-256: 53538831ea0d066c372b10103cb4a28389532161843f925d23e94a898132a2fa
font_01_sfnt_off00010020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10020 10704 bytes
SHA-256: c9979a807ffe0b71d57adae80be7fa4bfb0fbca0227058b75afa4f215f2cd4e0
font_02_sfnt_off000118d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1