Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca9869d2ad719f5…

MALICIOUS

PDF

87.1 KB Created: 2021-07-06 00:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1290e55e473541ad751c69967c7300fb SHA-1: 385b03e1c8ead09449430bd695e5f81626e48d26 SHA-256: 1ca9869d2ad719f560772facf90cc6916a9773f2c5e572399a02a9841b1c4c36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file 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 ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised or disposable domains points to an attempt to evade detection and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://kiuanai.com/userfiles/file/jurusegeg.pdf
    • https://taechoclub.com/FileData/ckfinder/files/20210613_F27C758B79B9D9AE.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a81645bb937---livikutorepi.pdf
    • http://kirilmazbardak.com/userfiles/file/xegak.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084aba36fe31---sameweteserinesufurajaw.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f5e084ffe---sexune.pdf
    • http://nhasachnguyenvancu.com/Images_upload/files/fofuwalekevafokataloj.pdf
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/dukev.pdf
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/mosolumiretufeporuta.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608348b12e938---ludaradugozawebaru.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/lfgs96ifd0efqvlnc1sidbohc0/73665876110.pdf
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/46107033118.pdf
    • https://bmw-zona.ru/uploads/file/nofonuwasawebij.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160714fcb84d07---manow.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077199d25031---poxunarovavok.pdf
    • http://forter.vn/hinhanh/file/40459419682.pdf
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/87894081429.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/8001ef7f86329f101465f6d191f0ea8c/89038842882.pdf
    • http://agavietnam.com/img/files/59893792208.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978d667b8f2---26924534702.pdf
    • https://ludifrance.fr/userfiles/file/56829662764.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/01055a1529d2b2bde47d469fe44f27cc/63509271250.pdf
    • https://igruppe.no/ckfinder/userfiles//files/57865706645.pdf
    • https://ajur.rest/uploads/userfiles/file/4222953880.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082727642a33---guded.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34a7cce0a---57617009800.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=kinds+of+external+conflict
    • 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_off0000f078.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF078 16792 bytes
font_01_sfnt_off0001088f.bin
c8e2348469a7cd14a808de4b52921dce22c9f42badc116fb5532e5c906bb2f0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1088F 10564 bytes
font_02_sfnt_off000120c2.bin
2b6c430398c8d7919d68c0b3b3e5a8b16fe525ce0f2f2442fa84696ed2f8fabe
pdf-font-stream PDF embedded font (sfnt) at offset 0x120C2 17372 bytes