Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d953cb4ec09badc…

MALICIOUS

PDF

70.5 KB Created: 2021-09-04 18:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9cfa642e94a5e473e14111d2b678f575 SHA-1: c0b12638f93153b2014232ed154647d4e5e8a929 SHA-256: 4d953cb4ec09badc325f95392c82b934435deeb441e57766b5a465238e617cd2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to these external sites, potentially for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964e14164e3---24592495068.pdf In PDF document text
    • http://abwbaltimore.com/uploads/files/97185710533.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/74697543771.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/58565768486.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/tusoxiwonam.pdfIn PDF document text
    • http://cosmik-kino.ru/sadm_files/57467895030.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eb86f1c93---rureturerawi.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/94830261596.pdfIn PDF document text
    • https://harom.ro/files/file/33549907833.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/jomumidaxumuji.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6b73c0c5e---19477176224.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210718130110_82fuzd.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/3c7d5735be1f9218c15612f88f81e1f7/tezotateseguxuzubefano.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad15c76e72b---tabekul.pdfIn PDF document text
    • http://indexone.ru/upload/file/vanataxelaniwesu.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/towudijadumurotitel.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/58627499068.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/ek2kre5qiopiqb3aku8m8h4mb5/50630303382.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/47759451853.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/tuxefitudaxuwuzasom.pdfIn PDF document text
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/25014181222.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/tevuletetevev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=tcpdf+background+imagePDF 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_off0000b187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB187 10948 bytes
SHA-256: fb7d149f57bedc44468529dd8ff937209922dbe22d3a7403e25ebc70dfcc3c9f
font_01_sfnt_off0000ca73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA73 16360 bytes
SHA-256: 0f96a59ab04d75425dafb3ebb44ddcb9ef39e2d02d39f06f2bd75356139c4663
font_02_sfnt_off0000f4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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