Malicious PDF — malware analysis report

Static analysis result for SHA-256 e419b1a698d3df67…

MALICIOUS

PDF

68.6 KB Created: 2021-09-21 06:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e8ca8f98728101cc886e7eb9afe1e3eb SHA-1: 9b3d7233fd5b61bc7158c9834e96571da84009d8 SHA-256: e419b1a698d3df67c3702a77021fa6068dc1d7b97e47081fdec10bb911d074ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further suggesting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=auto+background+eraser+apk PDF link annotation
    • https://xn--pssa17sw71b.tw/upimages/files/mumuv.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/589670239.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/bogitovekiwoxijuxiv.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/85231660956.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/97462337447.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/wefiliwaze.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/jenakaguferem.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/2f540950ee6d2f705fb8aad2db391142/29954265443.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/gififuxajufim.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/nudawejolozuloko.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/12863764184.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/sikagepekore.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109162030456415.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fb063b95f---ditutamoguvoxog.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161493e0ca069a---sunamak.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/2f25a066fc10eadfe16bb507a434382d/pawubitisigeposijefex.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/zorogawebisojadexagelek.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/20c9fe677a482396c0537dad56626ef3/23691653962.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/66056227717.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/pabarefebasiji.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/wugilotometuna.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/4652412605.pdfIn PDF document text
    • http://chengzechem.com/upload/files/felibolibesugusarafetip.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/22801301304.pdfIn PDF document text
    • 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_off0000b02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02E 10864 bytes
SHA-256: 398529a9204dd4e69c67c7ac4a9320b46c2890bcc5ad2b8ecd671d410739243e
font_01_sfnt_off0000c915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE127 14716 bytes
SHA-256: d025910d0efc5a6e1a44694cb00eca2493e43b2302d272c619adcaa1f6361ac0