Malicious PDF — malware analysis report

Static analysis result for SHA-256 e993245d06c827e2…

MALICIOUS

PDF

71.5 KB Created: 2021-09-06 18:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a6c0ff78adcc0307ef8dd478a030adec SHA-1: 2be05880a9738f648ba979906cea2d64f86b8019 SHA-256: e993245d06c827e248c3e87e390fe6822b0cbe8036118e64279e2c0b56a5f08f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs pointing to compromised websites, likely for phishing or malware distribution. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially track user engagement with malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=resnick+halliday+krane+pdf+quora PDF link annotation
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae895eda9bd---bapaj.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/71064159596.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/63fda228e75d7b4302d3cf2f6ccd7c05/90372682966.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/14453624897.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/li3ota7pl7vh9ta1l6k4va55b0/rawesugifakelebu.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73a7fb5671---4797711817.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b722bc759---fuvimuredakisurijiwugut.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/susovitebupiladuz.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ace2a3440c6---55948372838.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/gudujebemimodigimaz.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/63582042605.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/referevobuzika.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c57c8b95255---77670025761.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/b89706b6dc1baac24cc13118c148ebf8/zekatosi.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/51573800704.pdfIn PDF document text
    • https://stauber.lt/images/files/68843728941.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/tizal.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/linabofizarej.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/37822177820.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/71ae21e202e53377dda5f71436a775d3/zujovakuzawej.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/81977572.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747e5b99d97---2542730788.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/36104020516.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/14972738884.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_off0000b3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FA 16628 bytes
SHA-256: eb86c65ae5f3c647c589d677cdf9734a9279f091ec17caf673bc8c2eced168d2
font_01_sfnt_off0000deb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C9 11116 bytes
SHA-256: 6f8b43f887e0310696947d845263131d1c2cef99d15785e132b573b54c519546

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