Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0317df3f9ed75e5…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 17:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0585e4cba61c031d0886e0428924f15b SHA-1: 6ec5882d9358f3c9be379308be974b5bfba1969e SHA-256: e0317df3f9ed75e5b046f97452bfa21fadb4285f8a75756d4c233d62f413ed52
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. It also features numerous external links, many hosted on compromised or disposable domains, indicating a phishing or link-farming attack pattern. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to download further payloads or lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://tedesco.pl/userfiles/file/9923052310.pdf In PDF document text
    • http://babetravelling.com/ckfinder/userfiles2/files/pesukefuribibib.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/49404705390.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/gth9629f8o45p730r6vb7icdg5/bibusif.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/96675797283.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/28048296714.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161355750cdff0---wubavajoloviruzufu.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de96b28de1---favedo.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/mefugoxixupimazipasaz.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/85781333420.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/16544277406.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8bcd0cfe9---51329069516.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/rawaxejowezinagemorowi.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/lupus.pdfIn PDF document text
    • http://kaies.net/upfiles/2109082245404437404yjc6l.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/mataw.pdfIn PDF document text
    • http://e-menu.hu/editor_up/71798301720.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/togugirabuxupemerufuv.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/muwofuvuvinago.pdfIn PDF document text
    • http://xsteelstock.com/d/files/86909380528.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/bogila.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/63295007573.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210903155523.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/runasidonudaruwozewa.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/mapijilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+do+i+enable+rcs+messaging+on+my+androidPDF 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_off0000d855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD855 17356 bytes
SHA-256: 7dc3fc4341a49b0f573f5b310954388d3e51b316539a5d49e9a7edfc5675928a
font_01_sfnt_off00010595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAC 10948 bytes
SHA-256: b808527f33a9e72d50af7e70cdb1f78017f370883599eb834ebcb5fb038fe76d

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