Malicious PDF — malware analysis report

Static analysis result for SHA-256 800ecae47e62c6a4…

MALICIOUS

PDF

87.5 KB Created: 2021-09-07 22:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c22456f3f04545d383f55cefcdec5c8b SHA-1: 79cd45efcb8ed565fa633aad252f79d50f255b5e SHA-256: 800ecae47e62c6a4797aff88dcd03b4dc4e874aa354ae127630c6dda30a38073
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wineart.online/userfiles/file/letotoxufimujukax.pdf In PDF document text
    • http://pinturasoltra.com/images/slider/files/77343120216.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/tawuk.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/53742037678.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210810004050.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/33496331522.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e465a8cda---76797213103.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/18752776192.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/74843083157.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021071703240798.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dac702b446---68667661756.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/voxerubogibanowalibi.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/a2b2fd550ad3be573fb8b91518c6ffa5/69195621926.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d4ea123dd---64585473451.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/73dc6eb390f07a72781600b3171e55b7/kerisumawoxof.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d257185ab---jakemi.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/63425690040.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/49731679403.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/nokajiditamososupus.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/54749478187.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be07f1b6a6c---lenekexodolesijeboza.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/mijagetanuzepi.pdfIn PDF document text
    • https://yodobashi-church.com/bovawibuti.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/divajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=plant+maintenance+report+pdfPDF 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_off0000f2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E7 17724 bytes
SHA-256: 512e55c1cd253842005bf4f140fbb43345122ff032766475ebeeedb6483847c5
font_01_sfnt_off00012041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12041 10616 bytes
SHA-256: 138c309005436ced6e03e6d40bee84fd541a07a2b5d92f27c453fb8d4cf325a0
font_02_sfnt_off00013870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13870 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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