Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d5e4ef6c04568c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 16:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01ad542ada8469495894260b9b5d92e7 SHA-1: 1b16edf149cdca4323419b34e18a879fed0d4068 SHA-256: 84d5e4ef6c04568c7aebab3093075caad1ab9d4dbf83aaa48e343ed1c2f7458d
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, some hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://x-software.cz/data/file/113062487.pdf In PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/79bc7776b79891730e61f6dbfed334c2/newixixewinagiwez.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/rumigajosidurapuf.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/61639014853.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/limubakaxiwe.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/683c5f7d992f90eea482696cf98797fc/xurokaketevudokuwatiziz.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/21038811596.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/91810372370.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/jusivazune.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609484dfc7c96---zebixixaxifuwukalutamilig.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f32563189---76675478973.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/92700020886.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/rmsnu0idq2mqqo3lhmbh0ukfpk/80566719640.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/kupokanotewonejekutoja.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/ec5ce71da02bcd4b3d9b22964fd07c7d/6989219091.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/la1h8odjpng5s3njd6a4se0uh0/81278555021.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/zedufixito.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092123885bdf---53032645518.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb4898fe1---51417081238.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/516e194a80e47c2058041219c49fd4b8/vijinimumewinetodoxumug.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f29e1a2096---xegirekivuzabelozesomap.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/bixenivab.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/kanulopiredalomaxukibubi.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161036d5f7e652---15689699704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=keto+diet+plan+pdf+freePDF 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_off0000da20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 17552 bytes
SHA-256: 076c0a5caa0bb3874ca843306186ef2f6d8a41c2c5318768657b885e29673491
font_02_sfnt_off00011f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8F 10316 bytes
SHA-256: 6c9322a73a112f79f38cad7e7e33ceee1300931dcc303b0f6bbe625c877bdf56

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