Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfeddb0c5d016284…

MALICIOUS

PDF

95.3 KB Created: 2021-07-18 14:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: acc01933be5d6cf6c777b2942e9fc4cf SHA-1: 6a45b57da4d514e3d16bdc8d9b6231e2a8330783 SHA-256: cfeddb0c5d0162840cdeb4f1d890df6ad47a77c57c9195e64bfc5b1b8d50a867
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to various websites, 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 structure suggests a link farm designed to obscure the final destination and evade basic detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dgjinhak.kr/DATA/upload/files/202106250147063541.pdf In PDF document text
    • https://elearning-chemistry.ro/userfiles/file/60309825917.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/n9fpaaq5iqskb7mgedqp0ihdi1/nuwafogul.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/85576735118.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/c8558d882bd4d566c84e628516b9481b/tovoludamamesipivox.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/la6f3lrg5dj73bfn8ln4udfmau/35167699332.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/reripu.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/5011441264.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609850be79574---nimuvam.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/57914474136.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/vawowap.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a92c579f27---23845827584.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/busopujotonimibefebum.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/rimelana.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/potubowotamapokubulitomo.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/31743659345.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a896d065f8dd9bb1460aed1e35eb4cdc/71102818922.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/13a2f6512817414a2ccf77ce9045786b/39903619408.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/vtadu9tqnprtokmicmqbm7g6tu/jefubulux.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/av55qjhrfinvq2l1nldug2trk7/52643091850.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/wegatisazapa.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a60d5638fd5---nozimizanimonobepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=dilwale+full+movie+with+english+subtitlePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/66efbdb557343c57dc06d29505a43404/47430929648.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 22344 bytes
SHA-256: 643c5c4972f82de45ceac23a9a8b14494721a4262916045ceda864f0cf50aa6e
font_01_sfnt_off00010d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D43 10952 bytes
SHA-256: 0aa3759747edf814515428d3d019b7b2f67052268e1d7002b7950919995de022
font_02_sfnt_off00012688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9A 18568 bytes
SHA-256: 3a7a7fbb91b16570dcab2ef4deea45509c47f20f4727c14744fcbb95aad04b56

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