Malicious PDF — malware analysis report

Static analysis result for SHA-256 11bdc1d2765b849e…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 06:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1e5bb04c12a3b60fef8eef1348a9226e SHA-1: 4c5e68fea7e483d02b7c98610331a01fe8e68a1a SHA-256: 11bdc1d2765b849ee20f6bb1725744f63fe43323b83a962ac8a3656d359af3e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to WordPress sites that appear to be hosting PDF files, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing campaigns that often leverage embedded JavaScript for obfuscation or redirection.

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://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88087a063a---45927082829.pdf In PDF document text
    • https://ewastexperts.com/userfiles/files/xafadorijafaf.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f39732afa43---doxogidirisawanajuxem.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff271faf8---70026994520.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/40516964032.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/faralalolamebegi.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acb56a936bb---lalarupu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae94060172---wewosupusi.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/35497295937.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/fjer7mitq71r34cmbme82k60b0/67858679379.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/26801352731.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/51090033041.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/raromutedem.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/94015013000.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/zawizo.pdfIn PDF document text
    • http://sfera-vlad.ru/img/file/69558244452.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/42171724758.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/bhljteda3rrn3j3uucq8e46m4r/5709917470.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cdcbc444f---jakexefawiribez.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/75300868822.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/35919008119.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/xenixetakive.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91fe878e34---59378311543.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/xeboz.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c17ea90ca8---40039240570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=rca+7+tablet+user+manualPDF 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_off0000e294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA6 17852 bytes
SHA-256: 56af48f2d2478fc8c5c1fe0b6fe5182b1c51cc84ea8d33271ad60272b0550efa
font_02_sfnt_off000128c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C4 10512 bytes
SHA-256: 9f48976a8093eae449b8a2eae011d84c1b337e4986fe56b734cec7331ee94aca