Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27b1bc54b4d946d…

MALICIOUS

PDF

91.5 KB Created: 2021-07-05 12:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be95a670614459be034ba2594e80631f SHA-1: 0febaaaced6f7a983a2acb447e6102d0097ea5b0 SHA-256: b27b1bc54b4d946d72113141092417643886737770e08516798c888d8ea674ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/9893716598.pdf
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/18601617943.pdf
    • http://kompletucetnictvi.cz/files/file/benuna.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d301a0618---8479339481.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097329402a64---84358192259.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/39b9251ec4c0e811e66a8cf60936753c/wuvaraz.pdf
    • http://webursitet.org/Files/file/32046170362.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gabawaz.pdf
    • https://termoformat.md/img/files/84766120011.pdf
    • http://sacoorhealth.pt/site/upload/file/27252804651.pdf
    • http://liccuza.ro/stiri_files/file/mopezorifunupavepef.pdf
    • http://hzbmsj.net/images/upload/File/57459130342.pdf
    • http://motivationandmomentum.net/ci/userfiles/files/79544692234.pdf
    • http://oticonshop.net/ckfinder/userfiles/files/dunedobijuwevareritugux.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/bgvk774jt1vime21i7d3ule74r/zaxegolibavalitosiv.pdf
    • https://cmsschoolkg.org/userfiles/file/70281301841.pdf
    • https://study4student.com/cache/fck_files/file/79688245763.pdf
    • https://fa-vietnam.com/webroot/img/files/lexigodurugejid.pdf
    • http://shinies.ru/img/lib/file/lubanoza.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9b5c42c53---zupegagekonerive.pdf
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/64640734170.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6607fcc428---17997549682.pdf
    • https://chupwo.com/editor_upload/file/18537205820.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609208a5ace48---damigusoram.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ps+play+unlimited+apk
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ad.bin
3d36c6b0da087addc30a9d54ec51c263be1d761128a5ae279401fcf3c4589930
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AD 19460 bytes
font_01_sfnt_off000118a4.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0x118A4 16164 bytes
font_02_sfnt_off00012e1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1A 16792 bytes
font_03_sfnt_off00014631.bin
a5b4e94a0d11217813113586f1150bdd7a3229b3c671fded11e41ba342283552
pdf-font-stream PDF embedded font (sfnt) at offset 0x14631 10640 bytes