Malicious PDF — malware analysis report

Static analysis result for SHA-256 16cad3d0836c6a34…

MALICIOUS

PDF

114.5 KB Created: 2021-06-09 07:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 382547ecd110bd8981d368b3dc2e6143 SHA-1: 45f3d87aa88103a85e401e00d15aae9fd9def8ea SHA-256: 16cad3d0836c6a34afc0c983afd24420896381d673cec86276c22f53063698b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://drafthe.ru/uplcv?utm_term=autocad+for+mac+big+sur PDF link annotation
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/997bd1a753ccfa0459ea2eed1ff4eb3d/taxologorateguj.pdfIn PDF document text
    • https://schmitz.cz/res/file/61104712686.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/49329995502.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/1284434619.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/55212343782.pdfIn PDF document text
    • https://ikima.fr/uploads/file/89660411239.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/f7a381de95bbf01d6d68a82b6545d947/92428057328.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/9098ba646ccf4b17847eabf203b45796/64632139843.pdfIn PDF document text
    • https://careeraccelerators.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076115fafb39---deguxiz.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086df6fa11a5---37769448431.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/055a6950082c50361f999f7199359ae9/8334949921.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/jf18i5p2fligdcvo3iik8iksjc/70811492403.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c318716680---15506360535.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2900be4e35f6f2282a9e666edcc9360/saxepemotizuzapuji.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095b0ba770f7---duvaxawe.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/fuzolefufabebenoregexek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13337 23108 bytes
SHA-256: 02518443e6dca91fb958528d95309dfb4b4168d29b77e334143efe7cc8580e28
font_01_sfnt_off000175ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175EE 5096 bytes
SHA-256: ba0cf7fff3a14d7683b65d1991bb607b003edfe7543bc1711028985684a93f41
font_02_sfnt_off0001873d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1873D 11600 bytes
SHA-256: ad58438a15d6891c6c20364693610970d3284513361f370cd14451260a2e6cbe
font_03_sfnt_off0001aead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEAD 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378