Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f23c51cbd5995d1…

MALICIOUS

PDF

89.6 KB Created: 2021-08-17 09:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a6b09b992ca6d100bc4fec5f06b959aa SHA-1: 1bd6b726e2631656ad2b9519ca287b9206de2589 SHA-256: 9f23c51cbd5995d19c8281888e5fd3c9b32c360b3c78253c44cc049eb037a213
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://infrive.ru/uplcv?utm_term=%C3%A9lan+vital+in+a+sentence PDF link annotation
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160800fd38fdae---tefanivag.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/44196274142.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/bj0e58ephnj0bhju1untrbrad5/rowogonowopejirovug.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/2pb2t6i6p0hl0p46bqs6238hg0/97704129498.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/73924164068.pdfIn PDF document text
    • http://safetypath.net/cms_images/mebupogal.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e285442100b---2335968332.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/66ebb6880ade400d0b78a6a68f198db5/vegubipidajozow.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/6jcrtc0c2vcf5a306dgk1r2o65/56528426208.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609247267eff9---zozozerosedile.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/vujipevopirenigukabawujul.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/22956495316.pdfIn PDF document text
    • http://landia-print.com/pdir/file/30783436261.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac112e9a1e0---vojapuz.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a03b42ccfa060a04c773af86ecf6ea9/63602149158.pdfIn PDF document text
    • http://dnepropress.net/files/file/82564648183.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/07/files/210705071352.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/76101757482.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e4da1d5416b---sadojifomurepuwapomux.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5fbca7f88a---disanopen.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/fepoxunetepunegotazodena.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/33082367462.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078611ba2e4c---93287119156.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/8530102b874a1101f3a6b3b86693de11/89449596523.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e46fec8c07---xenupes.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1e0e6b195---53366838709.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B0 16468 bytes
SHA-256: 7869d3d972dd50f598cf2c44edba0fe43399467adf83d3eee5929a3b2459677c
font_01_sfnt_off0000f7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC6 10068 bytes
SHA-256: 8a33234245bb30ce558806c1542a2f08186fc38672704d5ba10e1b6514c8b80a
font_03_sfnt_off00012650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12650 18116 bytes
SHA-256: 427c3a5d84c5f8eadc11b81aeeab84c6a8fba7d97c297a6cb9dbf9664b59f11d

Open this report in the interactive analyzer, or submit your own file for analysis.