Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8937d8e5f824ee…

MALICIOUS

PDF

76.2 KB Created: 2021-07-03 01:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 333a134dc0f1d4be530d666d6311e36f SHA-1: 693ff8703ca475320c8e2e0e75285629d255233f SHA-256: df8937d8e5f824eeb86915367492565f13539651faed9f3a0aeb68b191ab6a30
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/rea9r53q899d3fem3ngaa4dsb5/zumolarowupif.pdf
    • http://www.ecostroyservis.ru/File/mexaxubafakixubu.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/fqdl29m37tl2nsp5rdvhssqpdv/xobobabanodekinixeve.pdf
    • http://contelex.it/userfiles/files/72108285895.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/1c0ijbrb8s2kptu1qmahsmnrc7/livebofigoraf.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/c4a73fb9fb260133cbb10eb1090a3ae8/majukuvoranigazez.pdf
    • http://dientrotiendathc.com/media/ftp/file/87221894857.pdf
    • http://jrmhandling.nl/upload/file/22610955383.pdf
    • https://drsaman.com/files/masisebilijomalez.pdf
    • http://qiuyutv.com/userfiles/files/20210630054149.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d275b14c5---wulis.pdf
    • https://oxi-dental.ro/imagini_ws/nivolirodowijurozokofew.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/2a3koethl0ioq5vv5a9hlb5338/jukubuxativ.pdf
    • http://msslink.ru/userfiles/files/vubozadojuvolizararipupa.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609eff256e312---taramegavesor.pdf
    • https://argumentua.com/i/file/nifubuvukimovoxux.pdf
    • http://dieta-plus.pl/userfiles/file/gatexuxotuk.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607628bb5f420---40543692514.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac847c4df7f---75634071988.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080a3f27c970---10869039065.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086164bc7241---59364078129.pdf
    • https://247hvac.ca/fabulous1/uploads/files/dutumef.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b791b4439---85458098282.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=bohs+well+drilling
    • 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_off0000ca03.bin
9b77770b213d423bc5a4f07c9d573dada15ab3888f0c29f9de2adbb96b972fe8
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA03 10408 bytes
font_01_sfnt_off0000e14f.bin
7db8f9faf15cbde100580c58746851aee0c1b9ae00ff08d6bb7b7683b34fa058
pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 16412 bytes
font_02_sfnt_off00010be1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE1 16792 bytes