Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc6e1adf454169b…

MALICIOUS

PDF

80.8 KB Created: 2021-08-07 00:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9f9b4468fd9f18a07eb9c80ba28fdb31 SHA-1: 3e17a973dc36be70e0f040b1dfb8e20a3449ece9 SHA-256: ffc6e1adf454169b8fef4eb0a5a505dc40775bc7e0fdb3f921db7785d4244e3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, and the ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=convert+pdf+file+to+word+doc PDF link annotation
    • http://agisma.ru/files/pages/files/31305077937.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/r9upiispbddjgo6oivtgqfdqc2/14450918093.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/397a41841cbc9aab152cc73f313eac5f/39350292265.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9a8deb5dc---wovofuzigotuvuwekefijijis.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/95139296945.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/walefi.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/grbes1fv8l1c0lk8eq1rc9l21i/2533657999.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ced1c1b05731b9fe6e52bbd49cdd8f87/821941332.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f42e5e23e---9545298688.pdfIn PDF document text
    • https://castel.ro/userfiles/file/pagajide.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/vonepepoleravefagorivelix.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/3ab254b8ee23bb811458b37d68efec93/20506071225.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/kiwegojagodutaloguwaji.pdfIn PDF document text
    • http://phunhai.net/upload/files/90377506937.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/51594289207.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/17741904930.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/85164069820.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/18b1a9c347680393d73f42e00f8b06a9/97798246109.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-26/20210526040808307219.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2734d1b679---paxujetitax.pdfIn PDF document text
    • http://olympusflights.com/files/files/volipivasutawu.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/0adb68989f2104e317b9216f06611812/mipami.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/ribivabubojuxitev.pdfIn 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://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_off0000d753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD753 10468 bytes
SHA-256: 962b2f99894c65d088b7bca923df9eac20075061905abbd752dc345232469c77
font_01_sfnt_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 17228 bytes
SHA-256: 959942d7cf983cd53ec36814a74d66039c29a691725d5e9fc52e901743c3d958
font_02_sfnt_off00011c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.