Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50ff937a3029e30…

MALICIOUS

PDF

78.9 KB Created: 2021-09-01 04:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 072413f8fdffff7c38ff685a0e87c20f SHA-1: f99babed4b69124cc06e669177af2da2438fa59c SHA-256: d50ff937a3029e3084c29292675597844601d2042564c9e9ad1ccd9e4855b0b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript (T1059.007) strongly implies an attempt to execute code or exploit vulnerabilities within the PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://slhospital.com/upload/fckeditor/file/16767872642.pdf In PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/3d946e6a4f942834228035c92456726b/99494183615.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/66738548486.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a845f4dea1---44244428299.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798377efe14---57881525698.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/7e231405d3a0356a5a3913578429350a/31865560128.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/tebudotididelude.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/repimutodaxogilajiwi.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/6rs1fq4homa0pqcr72a3l59101/78406200259.pdfIn PDF document text
    • http://lg-palette.com/upload/files/11845343309.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/sejejuv.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/q1k6bb4gl9tr4usfm8knav1fjr/noxivirexupogoz.pdfIn PDF document text
    • http://usateatop.com/_upload/files/21111160402.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/62il9c413m4lrbrj40ji7cr2b1/82695042081.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/gonuxogiwepero.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3044049c26966999924dd9f73357f9b4/43061540954.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fe36f7eecb6---saleregaguvomofipegu.pdfIn PDF document text
    • http://kgmda.com/upload/files/zakemaduneve.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/14706586075.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/99928179337.pdfIn PDF document text
    • http://fotobambagiotti.it/userfiles/files/ditexexugagofel.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/imh7rgjff11u9vqbqtid5s12mc/9253690797.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/jolawexuxuwadanakoko.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87a521c3fe---kafurevixiwur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=lyrics+to+there+is+sunshine+in+my+soul+todayPDF 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_off0000cd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE546 10808 bytes
SHA-256: 063c3e9f73ad4ec55e8a27d3c6bbde25cad900fc9a602e860a53ae05670aeb3f
font_02_sfnt_off0000fe04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE04 18284 bytes
SHA-256: e60b05d1fe958fedfed438570eee864bc0e82d635c05c745ca8b8b34bf6fa7a3