Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73431ec7cb0649c…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 01:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: c1c532ddbd0d9c13b9fe61b79421f5c9 SHA-1: ac05f0e610c6ff5f330b414cd2d058032481a089 SHA-256: b73431ec7cb0649cdb13e56f0ad465d9723a78b745a2235ce2a84d6bde7a72a4
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/54323629707.pdf In PDF document text
    • http://businessvaluationapp.com/fck_files/file/60214322370.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/96290163242.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210910194530.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/5597794478.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/kexifunofekikefebixu.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/95023901219.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/12954107941.pdfIn PDF document text
    • http://artepcb.com/upload/files/81268789832.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/39874278033.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b31edb5b8---37597492781.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/52287826196.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/javizonut.pdfIn PDF document text
    • http://klhl.com/userfiles/file/boragoguwadolusot.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91381670778.pdfIn PDF document text
    • http://hidramaco.com/files/files/84061452432.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/nigarari.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98237272126.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139f1b4361a0---lokizolemegejepuzijubir.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/t1lqb68af5ga7urvg26n2bf3c7/weroganudedosefediwafa.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/9c894257eeae208ec3109c52240dcb6e/60181181610.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/96114374521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=uri+full+movie+download+mp4moviezPDF 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_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 17292 bytes
SHA-256: 147d4baf875ad3ae459d59d1d94ebcf585d20b93a727ded334d44975bc1d42bb
font_01_sfnt_off00010ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA7 10788 bytes
SHA-256: dabc0f8f944eab6001f7105570192b7882dd40ea0a9548bd05c8d300955d60a5
font_02_sfnt_off00012788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12788 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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