Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6a18eb8727eba7…

MALICIOUS

PDF

90.9 KB Created: 2021-09-14 02:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5d543cba6c70a3071f836cbcb917f04a SHA-1: b5889afa8ac1085dec4bae48de2092e936d29d05 SHA-256: 0c6a18eb8727eba76587b4dc7e0c83a3ecc140f816a983ec38d2c32037d9551c
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 0.9913

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://jiin-torng.com/uploadfiles/20210907020416.pdf In PDF document text
    • https://canionglobal.com/FCKeditor/file/xutimorixekirinamozepap.pdfIn PDF document text
    • http://poultech.net/d/files/63677797765.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210907090208.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/lph7hjh4vq3gcqb8ak01jgbgm5/tozawa.pdfIn PDF document text
    • http://texmet.pl/userimages/file/34083986831.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/kuvodov.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/pavagujemamapubawifopaj.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/begikojitudibuxigo.pdfIn PDF document text
    • https://zzwgjx.com/d/files/wixupaxuwe.pdfIn PDF document text
    • http://ubest.ru/images/file/bagubosenetulix.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f81d9ee02---vuvirur.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/78391242697.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161337b396f60d---70190156636.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/48362474550.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/pipazew.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/24559094565.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/71142843871.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/41105417415.pdfIn PDF document text
    • https://kultmotor.hu/images/files/givatukozuva.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/60936340678.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/89491223613.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e603fdf864---vikibidefitijuwur.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6c7f289f1---kemezikuzazog.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/88131023629.pdfIn PDF document text
    • https://mmszke.hu/files/file/70495582304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=android+game+source+code+free+downloadPDF 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_off0000fab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB6 10888 bytes
SHA-256: 5a1639afa7fcb0019e42976eb1147d7248d0adcd53c89434cc82b133d5366848
font_01_sfnt_off000113ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BA 18776 bytes
SHA-256: f5b3c89a0bb601530b983a3adf089b19da27e498624d0f64b4d125f9ea4304c7
font_02_sfnt_off00014563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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