Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b7b623e871abec…

MALICIOUS

PDF

77.2 KB Created: 2021-08-19 12:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2c30e66c17963956d20d95a24b81dff7 SHA-1: 6b47056e73a8a22316819bfccdd0558bf311f929 SHA-256: 90b7b623e871abec844848828a837e4e30294c519285452bf6f0441fe29a858d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the link farm nature of the document, likely intended for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076216438d9c---bopukoruwufitixifizediga.pdf In PDF document text
    • http://mlight.cz/archiv/file/22594704552.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/wegedatevixoxu.pdfIn PDF document text
    • http://c-six.it/userfiles/files/6532703242.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/59218478187.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/mimugox.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/1c0cf8c487facab19335f9371418d07f/wukup.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/16626146490.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/52188228567.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/f31fba793c5ec1702166ccc700578b02/87388404232.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/qm0mro9vd1u3jupdojofq1kblj/manupusanawa.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/14953899274.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/kokufurobewup.pdfIn PDF document text
    • https://actorconseil.com/files/file/ketolewiraparavutufamoz.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/94b13b6090275428d63281d28eabc058/28659966294.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/1da1eupgfve65ctajmip5sut09/88029251086.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/155cafe16a8f029eedbea655235f5f3e/jenufurusesel.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/bewijobesopapapa.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/5a015439036b561f2e9e1b7c67fec09b/41390992644.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/tubifexoxufip.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/u7hsgnbsunfnjhqptl82s8dn75/57701432237.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/30913400276.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/dasixeniwizazukorasezugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=miraculous+saison+4+%C3%A9pisode+1+streaming+vf+gratuitPDF 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_off0000c2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAED 11404 bytes
SHA-256: 7940da598491d8c6da16ecaaa8fbf19604dec5d7c852d46c01c7e216bcfdbf23
font_02_sfnt_off0000f574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF574 18212 bytes
SHA-256: ed357c0a665eb57e5cb87a447586013d14e266d440cc908a8e96a222a7552717

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