Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5b1834bfa4f894…

MALICIOUS

PDF

71.1 KB Created: 2021-06-25 12:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a520c51fb254643ddc4f3a1f4d460c5 SHA-1: 5c6acd2306ce7e389dc7c72fda3272fc8aabbd32 SHA-256: 8f5b1834bfa4f8947e6191c0d43c9eda8524b8595aa645f726b53bac7312a7d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the URL farm and the heuristic firings point to a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ketchas.ru/uplcv?utm_term=then+meaning+in
    • https://tepihtrava.rs//files/lerilimerojuvojoguk.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e8c592f55---35102875899.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2f5570ce0cea673fdafc40f0405cd7e7/89672527243.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/07dc1d6435c4c679dad59383491ddd7d/93934644142.pdf
    • http://au-coeur-du-temps.com/userfiles/file/21500377418.pdf
    • http://bobas24.pl/Upload/file/86211438014.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/76612043219.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609634802f1a7---24669057189.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c29bef2df---tutaxebiw.pdf
    • http://asesorgubernamental.com/images/file/sozamiwigugexodumilidesas.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37cf3566d5---felebolitasifiwejezuju.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b776b3aef84---43198742960.pdf
    • http://connect-senior.ch/uploades/userfiles/file/mojimikobom.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/628vbs8vcg5c220chfeso8q1t1/24279228202.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d845b9ecee---57855612284.pdf
    • http://wallsfamilyreunion.com/clients/876683/File/48198415669.pdf
    • http://alexhofford.com/temp/files/file/pugadis.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B8 16792 bytes
font_01_sfnt_off0000d0ce.bin
c82fd707c736c51c2fdfc9eb4dd148779a856b7200b59025a0ad134523f4ffb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CE 9988 bytes
font_02_sfnt_off0000e69f.bin
1a8a3ed08824ac2cf225b816445566f676cf86adb799a8f378ac6fed320289a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE69F 16160 bytes

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