Malicious PDF — malware analysis report

Static analysis result for SHA-256 78096b4877ad596e…

MALICIOUS

PDF

90.9 KB Created: 2021-07-31 20:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dee95294d7620e28b67d02a922b74de5 SHA-1: e37356f05cc4425c8f1c5ca630b2e03fd9662ac8 SHA-256: 78096b4877ad596ef8907c30a615f87935bf46b1be250f28d08123f10aceba9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of ML and ClamAV detections, along with heuristics indicating a link farm and compromised CMS uploads, strongly suggests malicious intent. The document body is heavily obfuscated and unreadable, but the overall structure and URL patterns point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=philippine+science+high+school+entrance+exam+reviewer+2019+pdf PDF link annotation
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/27908777163.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/vufapurafiloxidasekowejob.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/viwodomuderilizomasoli.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/jafozuli.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/daxarowe.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/33e36a516ce4f47ca6844568f5ff9ab2/3823463632.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/cf5a2b87220f1ab8fb9cf8ec1274b1b0/tasereb.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/sulefuru.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/marejekedefanura.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/sufegojidajoraxiripi.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/e5cec00549bceefe94c330c659382354/22628304894.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/a552e6d1eb8e4065073f07611ba66bdb/zuwagegixi.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34a83a8897---bagapudejed.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210614_130729.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/bekozeka.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/sawumi.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/2219260513.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704f28d9aa4---48987086464.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/55845318256.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160774127668c9---22222966138.pdfIn PDF document text
    • http://df-foundry.net/d/files/bisojubes.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/0096792ce30f6f35268aaefc57ffcbc9/ragotowexalaxaritu.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/11457359428.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/d4e42c40ebd88bfe66d802b1ec103422/medufoxujifojosufisedug.pdfIn PDF document text
    • 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_off0000fa85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA85 17664 bytes
SHA-256: 7bcc46884b7f4a7cfac0dad1ca4c9cf34829c6f98919edc84b0fa12b8298d57a
font_01_sfnt_off0001286d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14084 11784 bytes
SHA-256: 723a029478d29afa62c098f552b4487339e831c54d2fb336d08983b19d061e56

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