Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc95205053f7d38…

MALICIOUS

PDF

75.2 KB Created: 2021-09-07 02:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d1c1c9a788fd43275809944f0a800f55 SHA-1: e4f3a5bba6d4fa393762972ff2a8719b1437e0c6 SHA-256: 8dc95205053f7d384b7075365d893b70653c416a1aff95a82e4855d816c0ffd3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/24583993195.pdf In PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16119d9927c09f---93307663076.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/55ae30a95c182bc865f3f0b7805589b2/fiwoferaradugijolorukave.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/19534306717.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/i77s0u552mcelt2b8rh50cf8l1/patazegozegasuwanilixujab.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd424a8a64---62258589832.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/34259377239.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/lamukufudosebepipuzidaj.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080673aba55f---jazuvovexefalonegid.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/bb6a45jp0pml3cksiq054atrlf/66190061871.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/817fc4e9a6e0803da93f5e1a955b6ff5/woxubasuposol.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/kixorisupujemuxojagawamad.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/xalela.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ace3b0ed02---javeruferezepivuto.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/19050893845.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/98437627805.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/9173798462.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/sexurunemakerofuloket.pdfIn PDF document text
    • http://surtek.biz/image/files/20150221_091729.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/melido.pdfIn PDF document text
    • http://flemingfamilies.org/clients/8/8a/8af36a28baf44bfc7b8a7004fb4eaede/File/sutisobenogav.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/jizoduleda.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/6db1e2ef512d47ab8ac1a746a5bac714/zururuf.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/17310946174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=libros+interesantes+para+adolescentes+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_off0000c168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97F 10708 bytes
SHA-256: e85e4f93cc0fbb604ef37d480e9f7921d9dfb2dcecec401aefecff6bc5c4387d
font_02_sfnt_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 17788 bytes
SHA-256: d37a4f15555d3e1f38f7d30bc2d903681eb09b552f91b7557ed5cd5414c89c34

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