Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecbc5bde2c1c892b…

MALICIOUS

PDF

88.6 KB Created: 2021-06-28 18:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fa76314b2d3c7f5864d30b89df70d47 SHA-1: ea9c9c72b82bb70affc7149016b077e0cdfcc0d3 SHA-256: ecbc5bde2c1c892bc6783669ff1177dc1876c466dfb916a0fdaec9198e586f51
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ndt-tl.ru/upload/file/gitipaganako.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/9be863ba18f7fed4a95a65882856cc44/nunixorumijase.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/0dab8eec482d34fb4c2a822a541d2c82/guniwosurizogefaxabe.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/284e84171482724ba6e586142a0f1752/redimarazilafe.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160744f2d0381b---99434934563.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/9e7d62fe454e3e193df8ada6018a0833/18026137716.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d95d515cd4---88697242006.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/rh8o8dq8mi0sr17mrd986f4pp0/64783687617.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4e4d9abc1---zomibovixowe.pdf
    • http://konditsionery-reutov.ru/upload_picture/file/93687500975.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/1d537080012c2b34a436e49b459e4268/zumefu.pdf
    • https://myphi.biz/nbloom/fckuploads/file/12311241439.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/66bfp7nav64cmn6u6nfajbe413/73708664317.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/272c11b9af7c77730dbd0845464588f0/23783214562.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/49a80a4d6bc77f8a9adaa142bc571925/11976922052.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609867d374a35---xaworipel.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c546b03d8a---15025414694.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1cb70c9fb---dapokovenemuwejomijarek.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b479221f696---zenalod.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a9e5875c6---zovuwabefuxarariwepazatej.pdf
    • https://vietrocknet.org/app/webroot/img/files/gegujovakotezenu.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85f114ba6d---nufet.pdf
    • https://hagakure.by/upload/editor/files/nukutewiximogisaloduf.pdf
    • https://oncetrabzon.com/resimler/files/70862355137.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/71ce34717bfd3bed5867027ce392da0a/36329955538.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+convert+word+file+to+pdf+in+android+mobile
    • 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_off0000f4c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C9 16792 bytes
font_01_sfnt_off00010ce0.bin
cb3a76d17c85bd72e7690ad433df4e239065ecfbce7c034d5fcc8fb6572ebc39
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE0 10896 bytes
font_02_sfnt_off000125d2.bin
574cfd934fb4c20f0271ceb6ccaab15a6236d8f2324ec4c976fd88b8b7f6f0f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125D2 17204 bytes