Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5a64c94771af81…

MALICIOUS

PDF

72.6 KB Created: 2021-09-04 22:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 325593ba99f81ba1e5aa15794ba13465 SHA-1: 4ca44e446a0da8786585f357281b014b58d1b836 SHA-256: bd5a64c94771af8197c818d9322e03832ec64f781f3de8f3b26d3c1ed586acf0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised or disposable domains. The presence of numerous embedded URLs, many pointing to PDF files on various domains, supports the conclusion that this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://aqs-group.it/userfiles/files/59845093828.pdf In PDF document text
    • http://wowbond.com/upload/Fckeditor/file/16157668439.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608349d89773b---82256458867.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/tadopoto.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/98997060930.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/thaf9jvirtqcuc9tfqi83o22e9/46624678007.pdfIn PDF document text
    • http://com123.vn/uploads/file/27826442393.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/suvutafetakuramokokubower.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/14006411048.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/6dde7150f37b12f2475ac5a4897d85d7/wijipuzerekofipuxuzubo.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/e7ullk747lilioo4ojgevtfq3s/48046905764.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/xojukowuxagodoxisusibov.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/47051268493.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a978a37585c---getegutitilukoza.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/lopitapilevo.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc55dc8d58---4631497820.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/vutoginabid.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/87b81b5bcaa56607cf5d106412d2f8fb/54420228431.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/87937956246.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/tadidam.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/22615834215.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/54548663941.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/dotokexuvete.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f9be126cc---duxoxa.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/bemibaladunemelebuxijuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=excel+macro+to+consolidate+multiple+worksheetsPDF 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_off0000b8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10E 11140 bytes
SHA-256: 2594614c9047c2dbb79102380bb840451558062d7dac5222b0a0bc6228066d66
font_02_sfnt_off0000eaec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEC 16192 bytes
SHA-256: 40e542378b1ee282edb2845b353f38d4cdf3be81746d43314011db858a28611d

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