Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a4bfd2cfb71b9e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 20:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 826f18500f3e112d90f890e5299d2e9b SHA-1: 50e3125c6716dbe381cd49c42eb9db37d8ae0004 SHA-256: 59a4bfd2cfb71b9ed7f31ac9cc224d7d4b4a96f910d0ab4efdd5654117e03b08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. The presence of embedded URLs and the nature of the link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=the+headman+was+a+woman+pdf PDF link annotation
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/2ok0tintbq5deuutpfb7pp453f/2777160134.pdfIn PDF document text
    • http://mgrima.com/files/file/33697238634.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/lalafivafosu.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/71491802596.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/mopomufarugowafozuwutuwiw.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/50207698097.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/1630080429.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613603b02dd0c---96623363228.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/gibogadururutozuloxojeje.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/mazumumafidabof.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/lidas.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/dukubivug.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/1844531966.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/05c71207e6903122d6c1505f991818f1/5868083263.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/28004379331.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/59182713727.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/95911603431.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/72195720288.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/vafivik.pdfIn PDF document text
    • https://shidoremicrosys.com/media/divek.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/mejodopisaxukufez.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/44294980494.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/20082491582.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_off0000e188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE188 16936 bytes
SHA-256: dc922eed82e57e412e443e53c216bb0204c544eadd6c063cc355abae7e5ed76b
font_01_sfnt_off00010d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D72 10476 bytes
SHA-256: e198eb9bbf7080ec7b907103facbd846afc7f0792818e4f0b5681b51eccea64d
font_02_sfnt_off00012518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1