Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab590dbfea73324…

MALICIOUS

PDF

83.9 KB Created: 2021-07-22 07:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c878b9ed15c1b6386dd678a97cecc3b0 SHA-1: 6e41b8a932cb12a48613645cd891685098507691 SHA-256: 7ab590dbfea733249e220f3e53ff172944fbca72dc4e7116e6bc0041942ee0d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/dcddcf087d544979b59074585fa53507/2865056253.pdf In PDF document text
    • http://studiolorenzoni.eu/userfiles/files/zarote.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/90450411480.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/94204513352.pdfIn PDF document text
    • http://zxsolar.com/d/files/malinuxoritakuwivezu.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/11063818176.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160724a4088222---lidoli.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/76aa9d87748c1bb5500dee94a569539e/29823438548.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/linevow.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/gumedozij.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b35ba6ef1a---nufoxopafulujakofuwa.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/sawosamuxuvitagodare.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/salor.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2diur5o9ltuesad7a8flgph13m/81481129468.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/0bbf63a9f449e9fec4789973e47f98d5/rakizifetodipi.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/6cj1qv9jb3uq0qh98324s8q1ug/nopasaza.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c558b21dcae---33426676852.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vovotowivusegip.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/gbbpmgjcb15tshq7gjq2ilg2k3/33421649749.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/6252fccea2c511a83f30ea35c7f3d609/jajamenedi.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d3754ca9b---21467081133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=convert+the+following+mixed+number+to+an+improper+fractionPDF 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_off0000e328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 11424 bytes
SHA-256: c46578db5dafd2409783a5ac13d16550c7f24f77f7908c8d0f6de496090c4d84
font_01_sfnt_off0000fd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AC 16716 bytes
SHA-256: ddce48f201bcce3a7448e631863c39945ccaa73c9e4c25edcf2d46542c953e51

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