Malicious PDF — malware analysis report

Static analysis result for SHA-256 cffc030d8a8275b7…

MALICIOUS

PDF

85.1 KB Created: 2021-08-31 06:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ac1a0a220461d99bab3d4e26f4ee1a01 SHA-1: d97ccdfb0092476125bcc4d3b181749d42be043b SHA-256: cffc030d8a8275b7342278a13d93c754c9fffbee8e7980dda74b9ab30d6c5439
156 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as a malicious PDF. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The presence of these links suggests the primary purpose is to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://luvnchrlysenglishtoys.com/clients/861429/File/korufib.pdf In PDF document text
    • http://www.pranabkumar.com/fckimages/file/butepitabalamarifogibo.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/mutelogilofakobumanu.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/30362946842.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c208c9871fb---7407197564.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021511315221255.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/926a70ee582ff837e4e84d8833e09f47/8756820237.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/39764807531.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/626e333b647d95b568c7b766677015fd/23838941455.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fugatanuje.pdfIn PDF document text
    • http://splogservice.ru/content/file/zuwodotiwex.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210826192719.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884161c551e---43483118421.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/lesezositotisejeteg.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/jseh20f379kl1c2gb4gk510kje/59792293062.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/86872945038.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/tamizekipijesag.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/c03dfddd8a350546239cab83631c148c/weruxidetedokas.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/591c59964fb5ea4ca0efefbc83975e67/17487723707.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/71857847289.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/molug.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/jonujok.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eac483fe4---mubadudiwodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=dpt+is+a+vaccine+used+to+preventPDF 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_off0000e7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D6 10628 bytes
SHA-256: 08840e99b42791f550190505bf2573eccd43e91c50fd57fbfdbe36e3f5cdd62e
font_01_sfnt_off00010056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10056 17944 bytes
SHA-256: 69d49c8b549b6ae0c19895a2327f6a55697b5ed30ce6e19aa031a28ff526cd51
font_02_sfnt_off00012e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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