Malicious PDF — malware analysis report

Static analysis result for SHA-256 d247bd5e06c8be33…

MALICIOUS

PDF

90.0 KB Created: 2021-07-02 15:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9e470c485f3ffbd1bed273faaee0d07d SHA-1: 042339d86a711d95dd7ade09094641f9f68480f0 SHA-256: d247bd5e06c8be33692bae7757238e66ff977d054be2afc07c10a6625eec8bea
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, but the presence of a link farm is a common tactic for directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://wastran.ru/uplcv?utm_term=how+stressed+are+you+quiz+pdf PDF link annotation
    • https://mtmnetwork.net/uploadEditor/files/zasiwitotev.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/tejusikigofurixutijokele.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/79mvilqlb2n8gkgrlanida5tu5/solokimomudidewirotov.pdfIn PDF document text
    • https://tsegypt.com/file/49531978988.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/650e33ee03af5193c8236743aafa077b/75223947279.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/39584975804.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2df2ce6ae---xenotebowurafenete.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/2913023643.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/30510650532.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160871ab608d34---bifapa.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/lariguvu.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/38153012072.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/8d667a5a14a6f304d9c52e6ffeec903d/4480610646.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/21951794264.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c187e342024---42309022016.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e33c6930bf---91007324946.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093caa0c628a---vijutopaxomivexidi.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/jn9b7o6u5s0u5aop7h4juha802/vupovasivakedabazaminig.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16078e027ba20e---vuxalugusanivaveros.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5a3844f13---mazepedinujubariro.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/vupoj.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e6a1a102c---lumijogataxon.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/lupava.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/0b18b8775d369aa1cd40a7350eae45ac/53948317658.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_off0000fd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD45 17340 bytes
SHA-256: d3efb59b1895c22bc75f965f02b68cee32a75c15ec5197ca20acdbc629c696bf
font_01_sfnt_off000129e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E3 10840 bytes
SHA-256: 0fd50eaa4e257e9afcd2b1e7d5058136bf260374e5d2bc57f5534c28ca684ba9
font_02_sfnt_off000142ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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