Malicious PDF — malware analysis report

Static analysis result for SHA-256 e14a281963d6a091…

MALICIOUS

PDF

75.8 KB Created: 2021-09-07 22:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9ceb38d74c4cc4c14135281ad85d9980 SHA-1: 8c989e12b876263d22f12e497b4daf31739a4465 SHA-256: e14a281963d6a09190d98e7c4cd285518fd5ecb81f30a3bccf218505880cbdd2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/vl5usj58buohfaas663raott90/koxeluletorirozazut.pdf In PDF document text
    • http://derkwoo.com/upload/editor/files/99016463365.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/99127534503.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/52582907890.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/14313820309.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/78692039308.pdfIn PDF document text
    • https://samowar.ch/upload/file/gimetowo.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/luwafibuvedijowapuboba.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabed662eb---70327884749.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/xalifabetegetovotunavebu.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/11828922909.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210720_B10A52B685FEA8D8.pdfIn PDF document text
    • https://khanikango.in/file/74513536296.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/93818367663.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b42079ffe8---42103425718.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/vunijen.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/96684370eaf73826e02971d6790b05e8/vufunobapilimu.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad880c78f3a---ratexunurubukitasevujijeg.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b94fb0ec7c---sogotakevesamajawi.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/312ba2b60ca6dd1d2dd616fa9e058f17/malakunolibaz.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73928677775.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/vixodebelopozanawirozej.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31d404a56b---jobomojeveziwodi.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/lf9ks4di4chomg9k0os7npqc76/69239740462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=generate+pdf+from+html+using+node+jsPDF 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_off0000c0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BD 17652 bytes
SHA-256: 748b8ef793bcf2b2b679c7f3b93fddb89a9cffbd457b24b987df64b76969ce30
font_01_sfnt_off0000ef14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 11216 bytes
SHA-256: 8649fd7698e6e5b14aabdc4e277ac37e76f3036da714b6246c42dc31a53bbac2
font_02_sfnt_off000108e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1