Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b84360e038e640…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 05:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 382b05c93d9302b7b8499350d74dea21 SHA-1: 1670b287f774da4e571ac1ee47507b60195ded69 SHA-256: a0b84360e038e6407964091f8bcb301a54342715629372a6e9834a31ad0bb1b2
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, likely to host or redirect to malicious content. The presence of multiple links on disposable hosting and the use of UTM parameters suggest a phishing or scam campaign aimed at users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096455f38141---99750530415.pdf In PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1628132608.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/poneberexovoripemerusir.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210705040352.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/sasop.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/7ad9626924ee7d044d917c4e8201e5d0.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/mopinojetutito.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807255b642a---86032433873.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/44808889468.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/72029947009.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/27939ca31405bf8d4b2049d0164b682d/69132004149.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/vonumepogekekilas.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e155881401d418310c34d3bfd2ec7959/53958712260.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/mmiqcdabb23aqgjb8n839sis00/71423370428.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/topakagosexi.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/e32b5998f21e760f8f1cd4918a428166/miwetumimiwinifabogukeru.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/28140468884.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/4440152643.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/83632081041.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab26259ba7a---garokan.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/57015307948.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/taxojumi.pdfIn PDF document text
    • https://digireg.cz/upload/42153317518.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/11246355490.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/fobezabikeva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=stings+sylvia+plath+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_off0000dc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC75 16808 bytes
SHA-256: 5a682081603611c3e94ca361f4930aac751f070939e8f9d7e19ddd4ff9eb44df
font_01_sfnt_off000107ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE1 10680 bytes
SHA-256: cbf0fbd571b697f45e22d686bb7a6716caf70e6b3048502cf38c8a9805018bf9

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