Malicious PDF — malware analysis report

Static analysis result for SHA-256 9320b5b3b20f0cdf…

MALICIOUS

PDF

71.0 KB Created: 2021-09-24 07:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 928318416ce2c76fa9657cdf60eb41d3 SHA-1: 0dd2a5e385ebdb8a76dcf01dcac733a632e3537f SHA-256: 9320b5b3b20f0cdfbce92ec4faec8ea5ed23b2d332ae66a75fb3790015426c2a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and potentially compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=grammar+friends+2+pdf PDF link annotation
    • https://xpress2.eu/ckfinder/userfiles/files/zokimupejeno.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/jonanafojesifafadajitito.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/jetiras.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/75091079627.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/48023195464.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/47142189598.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/66330026920.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/susaxuxizov.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/16368133806.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5212941f4---bisazosanikila.pdfIn PDF document text
    • http://3sdent.com/upload/files/77464454267.pdfIn PDF document text
    • https://ms01bet.com/contents/files/48776561205.pdfIn PDF document text
    • https://hinaweb.com/upload/file/17587699173.pdfIn PDF document text
    • https://blv.by/upload/editor/files/zujure.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/51719598833.pdfIn PDF document text
    • http://midospa.com/upload/files/34365494395.pdfIn PDF document text
    • http://secoinblock.com/upload/files/96178758382.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/11381745934.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613a313d73503---gamapisizilotuwoluwa.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/sojurozobasowikuwopap.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/89773629039.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/97318884646.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315f9058498---28042456328.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/915d9db2b05afdda03c72bbc4cb29699/bigiteromiwawunejoror.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_off0000b808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB808 10556 bytes
SHA-256: 1ed86f3bb2c1edd2f63631e502f7039a768ad24d7f2418a5be0f1bd4cebf8002
font_01_sfnt_off0000d013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD013 14988 bytes
SHA-256: ba2587942c4f75fc2e0da9b059703a88b76664ee5fe45c1ae5f10977fa9df8c1
font_02_sfnt_off0000f67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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