Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1f5257f849e25b…

MALICIOUS

PDF

72.1 KB Created: 2021-06-29 09:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b9a2a43c73dbc8e9e8a59c2cb6a72586 SHA-1: 02e750b5b125f68f298f5b2eb7e82170acb00356 SHA-256: 8d1f5257f849e25b5622ef56b3d2c6d009c68b34230e287654463e8f46884eae
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The authoring application 'wkhtmltopdf' and the presence of PDF-specific heuristics indicate the file was likely generated to exploit PDF vulnerabilities or deliver malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/uplcv?utm_term=live+praise+and+worship PDF link annotation
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/gujarumuzimiloxunufapije.pdfIn PDF document text
    • http://uci.ir/userfiles/file/90341041756.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea345501bf---81502388031.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/lulosadijeku.pdfIn PDF document text
    • https://capecoralliving.com/media/file/62128366601.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/afbb61325253790a50d8faaaec76c8d9/miwus.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aa68bd1b72b---11218147405.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608959fed989b---69349522608.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/29415984997.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16091b795e3eec---povubadinajavulese.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/zeforedifeli.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/bkb73i637ujpc1m5v9770shjkv/18491469825.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/106b34699be46cacc0deeeca18737245/17644543116.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e23b8bdcc5e2777ea785b44f3559c160/pilixajum.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/f2d5ppo7ci5man5959f04fkc93/vedifenalakuvatebarofed.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/gunalutigezum.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c79af9cee11---pepatuxofarajaxefoles.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982c3941f36---dupujomabuwejebipubimo.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/09c6172e4cb26c9021f5b6fdb27829ac/valiwilaxot.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/9b194c0ed2aca3615d0573335f2f758f/84787694752.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021062814483970554.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb87d90533---mozitojovusavonetatusiw.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9ded24658---30804349054.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609daec474c12---jixaxalamobap.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/77251238542.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_off0000b988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB988 10452 bytes
SHA-256: 7d8f4388b3a1a0371aaf0b8ee32a6d6bc3797d393f9d6d931e41ce86cd9b8c90
font_01_sfnt_off0000d134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD134 16400 bytes
SHA-256: 44d368b02d922db6ab8fd5dd62d7a4bc862bb1985e71207c3710b5811ec5fb64
font_02_sfnt_off0000fb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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