Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87d4d43771e2af5…

MALICIOUS

PDF

72.0 KB Created: 2021-10-06 16:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0b4db99f391329ec4dca3e9c0fc4bac7 SHA-1: 1000c5fadd4615f9518b8cb91757a155213b21a8 SHA-256: f87d4d43771e2af5a2095ce8fa83a66a6766f4ccd2526fa9c4dd6f987c8940d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be part of a link farm hosted on disposable or compromised domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=choreographer+of+dil+to+pagal+hai PDF link annotation
    • http://zatoodesign.com/userfiles/files/81944917075.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/wazilozaxoborileneruvufab.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/mujifiwojizupove.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/bebujetuzuw.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/40460233350.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614821c57d80c---xemelobiwegiwoxagepar.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/8585769709.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/36237203057.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/xilutenosolevekixazubik.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/gefubafakejanebuwenuw.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210922170025_1860811188.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/sititimojiwixig.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/zovakitugorapezalamuguja.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/49307814807.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/97e2f08bac43760b2d91d82ba2d7f6a5/86072126603.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/akro3thgg542bnv957fkvsfg1v/bowubamoseto.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaac8be604---bufujage.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/wipexabusujod.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/d7v6qs83lspp0rcagibp32884l/gojuvomikevimame.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/dunoronoped.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/22196886752.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/mitorebepuxaxe.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_off0000b4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF9 10536 bytes
SHA-256: 156796b07bdb0916c8b089acc88282f4329eb417ceda29b2db81b04d7ff2e20d
font_02_sfnt_off0000e4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E0 17508 bytes
SHA-256: 45e1c477188f548a0464c0baebd9e165d058fdaa705ca814db0d36bb24496334

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