Malicious PDF — malware analysis report

Static analysis result for SHA-256 f841d0a8ff3f9487…

MALICIOUS

PDF

77.2 KB Created: 2021-09-08 06:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5c16ea0b987011640f6bfd6e1c63a59d SHA-1: 34fdeb449b272deaa86206894eca251872f5a502 SHA-256: f841d0a8ff3f94877c72f6e58b6941e147c70acd9879b146569e8a8d210e7bfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution scheme. The presence of numerous unknown URLs further supports this, as they likely lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec44d4a6d6---mugefimonuwib.pdf In PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/wevazir.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/26538672347.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/38957450164.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/gajunilaginekabepop.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/pofamivepis.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607119a2e8730---kapujeku.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/26690993242.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/53307327819.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/18689296537.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/35797803978.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16121bd49cba45---21081945734.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/xisatunogebapif.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/nuvugewagotimemanusijemew.pdfIn PDF document text
    • http://djpress.pl/Image/files/90838376954.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0d7e2b8e4e65801ef3ff46187e0d0f72/9218659289.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/72e4ce3080ad3404e39f2a19bfa63ee6/domajobovegekifimajoxomo.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5ce7a0afb---79021638400.pdfIn PDF document text
    • https://tavio.ru/files/file/jutonemojerolasovexa.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/34472811.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/52429078564.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/34251834951.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/zuruxirirazolamotex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=driving+test+booklet+pdfPDF 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_off0000cb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE339 10812 bytes
SHA-256: 660d0b05101fcba3bde6aff83ef46556cd36ff0f1e68811fd44844feffb25b9e
font_02_sfnt_off0000fbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD7 16980 bytes
SHA-256: 29b46380940b2a5d7e6c37f1dd39dc59b0a342b78b8aa0311cbc306952dd96ff

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