Malicious PDF — malware analysis report

Static analysis result for SHA-256 f790cbcad4e668a8…

MALICIOUS

PDF

82.9 KB Created: 2021-09-15 14:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 212de1f35f31777c053d9952ad08ce60 SHA-1: e7dc9dc9c5f4ab26233f05ce3054d7f7f0e0391e SHA-256: f790cbcad4e668a8bfde4bd88b13bfbdc9e8377a85090b09da64f87f337d681f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on domains flagged as disposable or compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially untrustworthy hosts suggests a coordinated effort to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=e+letter+thing PDF link annotation
    • http://purofirstli.net/userfiles/file/fosixibofipolofesezowig.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/36662960620.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090812583860.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/naguzalisosukudikim.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9b9101fbe---9445079592.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/nilewitipodutinomesixo.pdfIn PDF document text
    • https://network-italia.com/file/22668085527.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/90016126471.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/tozizozaxuvusasezu.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/nufikivu.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/xizef.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/28392937459.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/menaredebuwomos.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/74321215023.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/fujebewexajulasatul.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/7918005621.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/desodokezuw.pdfIn PDF document text
    • http://bankerz.in/qpic/files/23462049587.pdfIn PDF document text
    • https://red-adlay.com/upload/files/35530570915.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/rafifutamibopavipi.pdfIn PDF document text
    • https://vzglavniki.net/data/file/sarutojanibaba.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/vijivujamereberazalutadi.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc671d365a---dadebibolilosoz.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/35f01525d1b32cb59059c97c14a23741/88345681021.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/dijikulakoxanofagovelile.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_off0000e1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F0 9920 bytes
SHA-256: 5477c85bdb70f2fcd7ea32e21ecbe316f8eab6c43a8cc7b222e273113c9301d8
font_01_sfnt_off0000f7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBD 17868 bytes
SHA-256: 0c38a923d121907db117c90af27312eccec8959969d9249be52ab3f0bf19b2b7

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