Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8ce2d0e6bac314…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 11:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc60b4da71e18d8a7bd0bdbb3646374d SHA-1: 840578ca072af06a5376ef8a2c6f0f26a213d256 SHA-256: dd8ce2d0e6bac314d45fb8ed43c445515ddbd0f8a38f57e818860e099651d0ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm for malicious purposes. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of 'utm_term' parameters in some URLs further supports the idea of a link farm designed to attract traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://abcgsgeds.friendship-match.com/upload/files/woliwuvikibej.pdf In PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/fuxebajarosife.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/meketifunenu.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/42507712019.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/dejemanuzasodexofutan.pdfIn PDF document text
    • https://datenglagi.com/contents/files/24925966794.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///65085181531.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/bkshijti6iuj1naveiagjbvmf0/buzovidexujo.pdfIn PDF document text
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/jaxigelinugikuza.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161424999af777---pemedabibabudurupa.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/nenosuzidakob.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/6925066969.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/nuzikozepubitu.pdfIn PDF document text
    • http://arucax.am/user_images/file/bujeg.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614787bb01437---vetenamapupiwodedabeze.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/9ffa17d0356192fdba81022e34340e39/wizulegoma.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/42313685793.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/botorinofeboderoxa.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/83148416177.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/kinadozoligisuwemafuka.pdfIn PDF document text
    • https://italvaping.com/file/janagudukejatekomalofudez.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/pevabejinenexiwivana.pdfIn PDF document text
    • https://mots.alaxarxa.cat/cmsimple/images/file/9107254496.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/xopoxi.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/dirigadivejeru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=mobile+legends+hack+heroPDF 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_off0000b074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB074 14832 bytes
SHA-256: 0c390c4843e70652525185730e1ae25c723c9bcbf32347293f5433122adccf21
font_01_sfnt_off0000d582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD582 10776 bytes
SHA-256: 2c40af077c489b1466ad85dcbe5948066f02526e0621ceebde301fa163d13ff5
font_02_sfnt_off0000edff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1