Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73e4a7919c7ac60…

MALICIOUS

PDF

86.7 KB Created: 2021-08-17 16:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cdf42713b09589d1a89d9254f3b2b889 SHA-1: 2f44de4fe7621bcc59b9a75f6b17be5bb69f0162 SHA-256: a73e4a7919c7ac60aec5b9b4db2c146929f5594dd3533b06f7d570a0ad27a470
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or redirection attempt. Heuristics suggest it's a link farm on disposable hosting, and ClamAV identifies it as a phishing trojan. The ML classifier also flagged it with high confidence. The primary attack pattern involves directing users to potentially malicious content hosted on compromised CMS platforms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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 http://techsystem.gr/data/uploads/ckeditor/files/9733350710.pdf In PDF document text
    • https://balaji-technology.com/userfiles/file/78328221909.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076883de2b11---nasobojafopesurov.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/1652277b37669015929331a516f98bc4/luragurabojekidozixe.pdfIn PDF document text
    • http://poorclarescork.ie/images/91675229922.pdfIn PDF document text
    • http://fairtradeportal.pl/userfiles/file/79918072607.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/gobdo1je1je1kff6i06vs8mnsr/wowotili.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/bf704c58ebb3d129555f74a3e89bc9a5/jademijopowegukiku.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a243ee6c239---mabokawirunasa.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/99550757923.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ecc0bb6f7b---54104163622.pdfIn PDF document text
    • http://hidramaco.com/files/files/kokerisivomadixuxutadofi.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/22320894593.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be16efc2f19---pazezevasiwaresuzikin.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/74492755378.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/95311619974.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/petalogozasazerojimatulum.pdfIn PDF document text
    • http://starlightcelebrates.org/clients/4/43/43e9139217482d7666ce300faf566241/File/wuzemekezije.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/f3b464e4b50778fa5d03ae4fe63e80dd/gedovenofabulax.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/pimoteduledilawin.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a7757aa7840---1325208595.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/gigutezamo.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/kipapalujawexobosiruz.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01985d081f---matafimosoxejebes.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/92308206278.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/kuzadutimiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=mantoux+test+results+readingPDF 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_off0000f01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001082c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082C 17056 bytes
SHA-256: d26ed04646e3601b1b4ec418ae976a4b90ed88df274e08da0e4cbeef8348af8a
font_02_sfnt_off000133bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BB 10620 bytes
SHA-256: 11a39c2555eac108dcceb58dc0b5c8f260bc85b477bb012ba2231089361320d2

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