Malicious PDF — malware analysis report

Static analysis result for SHA-256 726f2870d26dcc41…

MALICIOUS

PDF

76.0 KB Created: 2021-09-11 17:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca71e0b6234a29d1e5af756765c4a55b SHA-1: ec6a71d8845fa428ca376c5a4e128f234bf2e319 SHA-256: 726f2870d26dcc4110280f8d50a879dd1ae99b1a2e63d56d0986dfeb4bed79aa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm. Heuristics indicate these are likely used for phishing or to distribute further malware. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://rosedreamholidayhomes.com/ckfinder/userfiles/files/zojumijen.pdf In PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133452c8e4b6---gagimiludaw.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/timimomulofugi.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/tezivev.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/kalujalowudusal.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/wirofulosinatatoxo.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/wuluzilokafegopo.pdfIn PDF document text
    • http://mousike.it/img_ins/files/fonosuzagurafiwezofe.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/zuwij.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/54212924810.pdfIn PDF document text
    • http://gibisch.biz/files/files/51325781917.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/muwetoxapunuz.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/44267887015.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/94030060974.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9289a35d3---83778680743.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/26045479989.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/35168955919.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349533d1f4e---9387990478.pdfIn PDF document text
    • http://eko-uklid.com/files/file/5302966787.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210910154424_707851149.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/lilevob.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/75175961924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=connect+phone+with+mi+tvPDF 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_off0000c76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF81 17292 bytes
SHA-256: 0deb7d0b7dc1015d9938b19e3d80cb533963d39c31c24bb60e5cbd8d79b564ba
font_02_sfnt_off00010bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC7 10348 bytes
SHA-256: 6073be6d371012d039c1add60ccd415918f507d7f9f38606023b184da48a92ec