Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ea39a29cce4133…

MALICIOUS

PDF

91.6 KB Created: 2021-07-08 12:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6adc8f5fa1ff10fbeaa7a0a4f5e4df61 SHA-1: 9f4dedbc2ef37cdb8d3ab3ae89308570179d6d81 SHA-256: c0ea39a29cce4133a079fb01eb2fc87dfec70ced5cc3e9261fd0805f6f83eb94
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and link farms points towards techniques used for SEO manipulation or to obscure the true destination of malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://jngf.cn/files/file/welexofewokowizi.pdf In PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/45872742669.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe66a0ff55e3bca796dada2230748553/mogufifavegilonokev.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/xonuzezarasasobokovawe.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608226e13e0c3---1904495955.pdfIn PDF document text
    • http://mebco.ru/images/file/savujuvipolirobob.pdfIn PDF document text
    • http://usmleworkout.com/files/file/kejetoranusivewojemivub.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/92139089571.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/36c45e4fc33fdd6f8a4d1b379f33a5b7/60867598674.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/effc7346d7fb4bfb34ec626d9df09951/49546306041.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/0b2c7sm34dv6lsn0jhunl60gcn/xixapenisatulofiwaku.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/27280471281.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/aa66d0dc41d1866f7eed37809c334ec4/45195798852.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160756fdd84cd1---juzibagitikusobubikisuvo.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/07bcc9bd9c491b18c2bbb40122962c44/40512266982.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/wopas.pdfIn PDF document text
    • http://sclifeguards.com/clients/16854/File/savasakefegi.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/9c5729bfed79b69a11129441dca42c1b/90292156543.pdfIn PDF document text
    • http://goref.ru/files/file/29446920794.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d99fad054ff923687a8bc8ed80fb4254/gozuxixarileg.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607375c50d231---fozikata.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/titotojexiborogutuvub.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/p116r0jicu2ume841elov0a83k/negakuzamatama.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/jabebugesomojolopof.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/cai34rqc2anit7k7tj1e9i7tqp/buxeb.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/33335227916.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/pesuxategawilegok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+find+zeros+of+a+cubic+functionPDF 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_off0000fed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED5 10800 bytes
SHA-256: 7076c6428d5ba6ff67ff2becd94ba4f1b2daef2a9727f35b68a4fb5a9bb42127
font_01_sfnt_off000117e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E6 18596 bytes
SHA-256: be2ae7c6293880f9da940288d812897e096f8da87025ef45666e23d32578ef60
font_02_sfnt_off000148b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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