Malicious PDF — malware analysis report

Static analysis result for SHA-256 348e690088b49afc…

MALICIOUS

PDF

74.8 KB Created: 2021-09-15 10:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 537dfd4f0d270fe403d2d2bb9fb55729 SHA-1: 693d99dcd91efaaf59c8a830e998bba951d13732 SHA-256: 348e690088b49afcbc3958ba463291808d43832183fac44f8467a5dc91931aeb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to disposable hosting or compromised CMS uploads, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to phishing sites or download further malware. The presence of embedded JavaScript (T1059.007) suggests potential for exploit execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://guojingmall.com/userfiles/file///93689237349.pdf In PDF document text
    • https://nutstudio.it/userfiles/file/17091775387.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410d5abf3a5---66699926323.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/98843445076.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/nepaf.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c65836679c---1659240530.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/25861389455.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/840841971.pdfIn PDF document text
    • https://fototipia.hu/files/files/56364618323.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140049421839---zonoralor.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/jarolab.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/wexevuxowupe.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614194a6c220a---8240077553.pdfIn PDF document text
    • http://hla.vn/upload/files/golizezurud.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/pefupewizive.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/kirufileririludajawapadi.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/tijirobirefolakefibilen.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/21204958976133bba6b50a0.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/wikoxadejegopemalagapadof.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///55980337989.pdfIn PDF document text
    • https://datawire.gr/files/files/8597542243.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/f3a6620c7d5d53777568c50d08ebae70/sukisatobefida.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/4470765683.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/63617808622.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/borewebuj.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/58021718781.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210907125326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=lucky+toss+3d+mod+apkPDF 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_off0000bfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC6 10636 bytes
SHA-256: f24580531c2dd8ebc0f1c900793a0379921aef1d8c8bb17242f2a3bead425503
font_01_sfnt_off0000d850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD850 17676 bytes
SHA-256: fad59fde29427d43ce098b044d045e766654c0c75c29ca67f4901abe56b80657
font_02_sfnt_off0001057d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1