Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6fc08f8817b3123…

MALICIOUS

PDF

85.2 KB Created: 2021-09-19 20:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6bcdeac31474038990ef9eb0cc41c2e6 SHA-1: 87dae7cd3b9d52e8ebf1ddd9f5f1a3cbaef73ffc SHA-256: b6fc08f8817b312353b284481d896a53aa7139a53d087765239142068d169f85
196 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of numerous PDF_URI and PDF_RANDOM_URL_LINK heuristics supports this, suggesting an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.vpn-solutions.com.pe/ckfinder/userfiles/files/susevafametujenasolud.pdf In PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/12500103047.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/96492368539.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/4ljjcd8bqjh16ded5rr32sla29/muwalikiginasiv.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/19491073621.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/30503109621.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f5af1d5ad5af16e4dd0b117a34b07333/762884244.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/7832538288.pdfIn PDF document text
    • https://harmony.im/userfiles/file/geroguta.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/67942634713.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/o80il9mcn4b2bvftirda3l4ho9/mejekatik.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/vikagavovedadubuvogufovo.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161455aff38e42---54782898572.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144cea86daa6---78656885392.pdfIn PDF document text
    • https://norservis.info/files/files/26631660735.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/ligadorosanaga.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/77355856942.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134add0bd318---dilokimo.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210908110331.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613616820b6a2---41779460302.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/49548734221.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/93648844039.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/keliwivu.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/jekaviva.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/zelew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=best+wifi+analyser+for+androidPDF 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_off0000e90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90F 10600 bytes
SHA-256: 191439dfafd3f7a0d0b49344d097a3cc913bd3c045c6a7496b3a4c99fc65e9ba
font_01_sfnt_off0001017e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017E 17504 bytes
SHA-256: 9722a6fd1a77535519061591969e5d5ae33cc44946044941f81af38344ec4638
font_02_sfnt_off00012ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.