Malicious PDF — malware analysis report

Static analysis result for SHA-256 26303ed305ab5c0c…

MALICIOUS

PDF

125.6 KB Created: 2021-08-25 08:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7e0c57a1931c6c7418a3d4c6e0abb08 SHA-1: 37e94bffed258892c23f7859d4d401290eacc6d4 SHA-256: 26303ed305ab5c0c93d9a660dc8a68e6b14aebe048b3c2a0879ad8b65801e541
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress sites utilizing the formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The presence of 'utm_term_redirector=True' suggests an attempt to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c134e34ba02---68601449735.pdf In PDF document text
    • http://autosoftware.company/autoresponders_images/files/24019941597.pdfIn PDF document text
    • http://tavio.su/files/file/sobofojem.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/powezijunomi.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b713696dc8---zunip.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/66250681761.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c36fab8a6d---61668425616.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/n3vdft85etfcec1rn5igesa8kq/duwidigiloza.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/36024018063.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/30569170069.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608145a58de38---13112185437.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be84d44c62e---wasisosa.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160eca0432cf6f---59426212097.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a095626c70---68881220571.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/limurikezomurivixuwojefir.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/40524980428.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e1733d26c---82890043829.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/dec902f602f4337b097790d25d75a9c6/sugabefuxukezozaxipununi.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4d85798fb---soturaxa.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/qebtf8b05fojt0fcmo41cr7pj4/38192583179.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/21961017945.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcaaf3b6e93---jomupavedaweretila.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/fac38c0b017b8b0f15f15a9bda83e998/24981611942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=side+effects+of+getting+stung+by+a+beePDF link annotation
    • 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_off0001889b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1889B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0AD 17332 bytes
SHA-256: 473d15740e1238785f7a86f2b85d0c4521e223e700309c0f4fb74ea2d42a1b00
font_02_sfnt_off0001ce18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE18 10932 bytes
SHA-256: 20f6ede66243d4287b471f6b9448e6b35fa69c2354fe8e0bbb3289993ef4f13a

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