Malicious PDF — malware analysis report

Static analysis result for SHA-256 e375e7732dd50aa5…

MALICIOUS

PDF

87.8 KB Created: 2021-06-28 02:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2815c695dcfd28f3321d3898ab8b94ba SHA-1: 0b546ab1362a651049edc0f67b2ad8229022112c SHA-256: e375e7732dd50aa52e0f234cd6c1503bd0473760950fb6283742c60eae45b7a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content or facilitate phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these compromised URLs. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072077b5eb96---842019366.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160ab20ab9779d---17325857029.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609faf276b0f0---5054514897.pdf
    • https://eobliecky.sk/userfiles/file/koruwaw.pdf
    • https://mvpartners.be/images/uploadedimages/file/29526691884.pdf
    • http://morethancars.nl/uploads/edytor/file/lovubetebeg.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c15cb415b---rilamajelagizefudavavu.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a61e52039---60656434287.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/56285549327.pdf
    • https://bleikss.com/userfiles/file/568535838.pdf
    • https://grupahatak.pl/admin/_fck_files/file/webavo.pdf
    • http://crmrealty360degree.in/userfiles/file/70830061970.pdf
    • http://buildinggodskingdom.com/webcms/file/83465345734.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076751e1a9b2---43623753266.pdf
    • https://aawyx.com/sites/default/imageuser/file/47065294225.pdf
    • http://onlinemidias.com/ckfinder/userfiles/files/mubodoxizoporevojevo.pdf
    • https://rsun.pro/admin/ckfinder/userfiles/files/18733717038.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16072da0804480---wunilimipikokoduwisofuj.pdf
    • http://yjsyrj.com/userfiles/file/99594947789.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/8a375920e74a2711e71b41eb44a2f46a/4141875901.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160852732a4f43---32067651943.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16089606618f11---76067487909.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/e52fil0rtf2931s0lj6d11m0ii/gulifuledokujulemopab.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=school+donation+request+letter
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6fc.bin
b9c07a38b2720df2c7e6bbb5ca3fbbacda01c5be64cc2da9d9cae33f9b3e2ed6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FC 10788 bytes
font_01_sfnt_off00010f83.bin
819b512636bf6a69a046508e5e10b265ba7d47869accff983b1f37b0ceb0aa2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F83 16388 bytes
font_02_sfnt_off00013a2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2F 16792 bytes