Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d72752dafdac016…

MALICIOUS

PDF

82.8 KB Created: 2021-06-25 13:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3135a7c24587ef70a1f138bd98735f63 SHA-1: 99367cee039892c95941aba37b2016254037a61d SHA-256: 0d72752dafdac016719a5e4e2c36dfccb06071822e072d36e46abf5ff6cc3175
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to multiple external URLs, many hosted on compromised CMS platforms. The document body is unreadable, but the presence of numerous links suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/otf0fb5uancftlsnourc4vq35f/14076428891.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a14e4eea790---gorujixiwoguxifele.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/9878210483.pdf
    • https://circolodelpistone.ch/userfiles/file/tutavenivuzosopisepudek.pdf
    • https://kede.org/userfiles/file/dosugegadukulajuwurem.pdf
    • http://adria-ex.com/images/blog//file/numezujemovig.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1016716be---12694837771.pdf
    • http://syarmarka.ru/userfiles/files/16213811686.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/b1ih8mplhf97t207d9jpubpjh2/2855377430.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16092a3015dbb4---69943010956.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfb88cfda6---98039459829.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/1df2820dc196fad552579fb8096a6940/fekatewaribapasegogozakep.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=content+type+http
    • 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_off0000e478.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE478 16792 bytes
font_01_sfnt_off0000fc8a.bin
96678865f019233955619cb723301c061c49abd7d61f2badae7579c4279057e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8A 17016 bytes
font_02_sfnt_off00012938.bin
7fb193f7de10e816f20ed5c38432b56e42459c65f90222e89ae744c91501fd08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12938 9928 bytes

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