Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab33bb6016f76b00…

MALICIOUS

PDF

85.5 KB Created: 2021-09-15 17:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5975c848d5af66ff82ee848068008e87 SHA-1: 26636487bb7fe2389920ae4b323c9923fb328dc2 SHA-256: ab33bb6016f76b00b47c91e9065c4789779afad9b7adb194e2e5e4593e6772b7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF-specific heuristics related to URI and link farms supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=no+limit+drag+racing+2+best+tune PDF link annotation
    • http://cc-loges.com/uploads/file/8246118041.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/50926811242.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/nexawowonefugadefupokezo.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/21562536167.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/jobisixaxok.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/xomigawoxekegiwod.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/9e6fe0f97080cd94ddbb3ba78381fe4d/mivemojikedegavowafirinoz.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/dosibipotetepadukozu.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/kulizinewojerav.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb717039d9---4363763829.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/38874333178.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/9911512229.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f59eda3c5b---17208124565.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/nurami.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/606874949f310d5724503bf94cd09c69/28027000852.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/sopafajijap.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/42882845151.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/7878904166.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/fumovexilawiwere.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/60985300177.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/35e61916d6c851140d38138ae4ff4fe4/muvofubapolase.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/mevodelogaf.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/bexanenobemisu.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161320ce08f0b3---mofijazarelozobudulur.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/39166115169.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_off0000e4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4ED 11048 bytes
SHA-256: ffce5b553eafaf25f5a275f8f73bfd6a5f7be372d6e24534542e4139a5f160ba
font_01_sfnt_off0000fe76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE76 19244 bytes
SHA-256: 738d5076888604f5f486fc6c5e4c234957c3bd1a99a82bf66ee5f8192b2f1dbf
font_02_sfnt_off0001306d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1