Malicious PDF — malware analysis report

Static analysis result for SHA-256 39bf668fc65afa67…

MALICIOUS

PDF

69.0 KB Created: 2021-09-28 15:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5fe03f848b1b5e200389dc0e5197880 SHA-1: 2bde8206b82599a293801e7cfe3ff34133378bba SHA-256: 39bf668fc65afa67ddde842401e857e9ff065772f2d74bc6fc6618ad1dbeff00
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.vandiestbrandstoffen.be/uploads/files/25810676232.pdf
    • https://gizaviation.com/uploads/files/34071613319.pdf
    • http://webinaris.training/ckfinder/userfiles/publics/files/gigorexokesuxeja.pdf
    • http://jjc-dev.com/userfiles/file/waxeviguwo.pdf
    • http://euro520.net/userfiles/file/1632626902220032889.pdf
    • http://huntland.hu/upload/file/kulimug.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/a86b713ff07870ca86757d8a42e2cb61/46726480365.pdf
    • http://ingmarcofaedi.com/userfiles/files/xevazeta.pdf
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/lidufixepiraf.pdf
    • https://unitytradecapital.com/ckfinder/userfiles/files/41198179001.pdf
    • http://youandisagenix.com/ckfinder/userfiles/files/pesikil.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/fb641ddb23c322fcda28f50cba782476/56360360213.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2deeed553---63095395356.pdf
    • http://moestuinwebshop.nl/userfiles/file/47882247501.pdf
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/gurilovilax.pdf
    • http://stagticket.com/fck_upload/file/jukonovonapowawetes.pdf
    • http://jiachuankeji.com/upload_fck/file/2021-9-26/20210926213134823675.pdf
    • https://jager-ig.tw/up_photo/file/vafitup.pdf
    • http://kancelaria-perfect.pl/app/webroot/media/files/fosevafevebilatisitamida.pdf
    • http://feach.ie/images/uploads/file/guwoxewidatatuka.pdf
    • https://bestcaps99.com/ckfinder/userfiles/files/1273205357.pdf
    • http://sosnovgeo.ru/userfiles/file/nojezulatumolajad.pdf
    • https://gretajensen.com/ckfinder/userfiles/files/bowugutalitapafije.pdf
    • http://nuovartea.eu/userfiles/files/rukesuladuwuturijodoge.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=oceanofapk+gta+5
    • 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_off0000b175.bin
2cb53d47f320a23bc2bfd1c3799e45e0eb10c459ed9d9b271d0652535cac779e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB175 10500 bytes
font_01_sfnt_off0000c99a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC99A 16792 bytes
font_02_sfnt_off0000e1ac.bin
bc37dd75fae84b234093fcfcd6afdf0085387647facf2de3428d82f2878d0a1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AC 14428 bytes