Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58d68c778d56af9…

MALICIOUS

PDF

229.7 KB Created: 2021-09-02 14:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d14d9ea4ab339233b2180edfab3f9f0 SHA-1: 7564dd5464eb9349e35f3aefa2c961d4c80108e7 SHA-256: b58d68c778d56af90bb70b87f0c3a3b0cc712aa1585e2ffa020d6d335f50901f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely using a PDF as a lure to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9509

Heuristics 5

  • 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.
  • 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://dogalakustik.com/depo/sayfaresim/file/domalirivukunol.pdf In PDF document text
    • http://podiummoda.ru/userfiles/file/foxisan.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/khs9s39nl11ec8esht3o672fv0/kiwopatupoteru.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/6595535abac784b97c802bf6ef169220/40866374884.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/xinonu.pdfIn PDF document text
    • https://5uempat.com/contents//files/belelovusurupikupa.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160712ed00083e---kosupanetip.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902e8fce9a5---9433504788.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/0k2ff1o43r06ep5ag0gmd5t41q/73590322072.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/butefuruwitovugalavejo.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25c110a3f7---guloz.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/zozajitana.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/dokofusigip.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/15340442636.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/27935064367.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/dubalusexolepojukinelo.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f93127597---31234370536.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/xijavobisadi.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c7e8487aa---vunufonadijokofipomitoj.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/lejedolajamuja.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/tupena.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/56016952424.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da60dc53027---53290367669.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608efe7ed10f9---48464964633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=cours+de+droit+administratif+general+2+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00036b27.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x36B27 17596 bytes
SHA-256: 41bac3d6077ea68a76ae4a93d95970a7fa25928a0a330753f75ad588c337d37e
font_00_sfnt_off0002eba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EBA2 11092 bytes
SHA-256: c1a799595728d6f92b62b7147ce43580da7d5f01ff832f2f4318b1af3d5b3f05
font_01_sfnt_off0003055c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3055C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00031d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31D6E 32124 bytes
SHA-256: 659734d992def0208d63bc1d1d29600d52943da10a3f0c9bc25be2ad0d441b4d

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