Malicious PDF — malware analysis report

Static analysis result for SHA-256 700a00d0e65e7954…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 01:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a66a1e77c106417c33ab3eea6902afd5 SHA-1: 9ac80d189368edf059e2e84158ec3c2d34bcfed0 SHA-256: 700a00d0e65e79545bab57da8d54cc3857248926f3c09cde07ad49617fca594a
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, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

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://electrogalicia.com/electrogalicia/recursos/archivos/vebisiruvorajujudaroz.pdf In PDF document text
    • http://na-bytecek.cz/UserFiles/File/zozepufedebitogewuga.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/12818284049.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/nipamifutivatakubipu.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/3ff9de9986cf84cc2c6ebaa4f12c03bb/8585046724.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/kemiwisavovowox.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/domamozajudofaviri.pdfIn PDF document text
    • http://ihdbd.org/upload/files/mijekatotati.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/fa92f913713f2bf579e07b6428ed4dab/92410406404.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/vomoninaboxobaxubibe.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/wugutawogafomaxukubonubig.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/samibifapasafebivisal.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-13/20210913054956888075.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/vovujolalatekavebagape.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/welokupevewujamex.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/362b757212dba1d2ff4662e4a5239297/xikojelenufuxafevutox.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/levotutivutizet.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/20396761784.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/gewok.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/sovelikedonisukutidibe.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/piwojebez.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131649ce6138---63851776400.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/6044827193.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/91736831528.pdfIn PDF document text
    • https://12shio2.com/contents/files/lifafedijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=apk+action+directorPDF 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_off0000da9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9A 10368 bytes
SHA-256: 1eb9a454a1e9845262a01c0489851a43b3e74e3e9eca90f2ef8bcde093eedfef
font_01_sfnt_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A50 17528 bytes
SHA-256: a314d921288ddd3f400dd70dba41d2aa0712ce83a9030a224b193a688b7fcad5

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