Malicious PDF — malware analysis report

Static analysis result for SHA-256 097c786c6655d579…

MALICIOUS

PDF

79.6 KB Created: 2021-09-08 19:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 13bbe9680036e0545afe6f0d9cf5fb9a SHA-1: 53aaa9b2ef10bac6010738c6f6ae10fbefa621c9 SHA-256: 097c786c6655d57963bab650eea7bf720b42f936650877422f3623f054b5ec37
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://webvitamin.vn/app/webroot/uploads/files/73938741877.pdf In PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/tunusepoj.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/pizukojefakunijogiru.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/jevapopamilixik.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/22950458272.pdfIn PDF document text
    • https://cakkue.com/contents/files/11141024096.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/23830326810.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/98753399150.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/wuxowa.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/vefixibazegu.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/fijepidegoginujegav.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/sefovofalal.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/9776111382.pdfIn PDF document text
    • http://congtyvima.com/images/Download/majovoxuxevujuva.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132bdd93cc34---fulozetelirapiwulone.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/watugilisusu.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161323f5016279---rezeboxaw.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/xilokapiguvowujolidiwemuj.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/zumosijodisosefufasiwo.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/81dcc97fac1018913e87f7a9b5e34d15/zebadivirob.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///18664580859.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/68830961771.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/89745472743.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210908_60C97F61BB5B006D.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=statistics+for+business+and+economics+11th+edition+pdf+free+downloadPDF 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_off0000cf36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE748 17900 bytes
SHA-256: 90239a68d05b3baafa6ccd651d66f6bd0fe547ad161955f828e133cfc1e04443
font_02_sfnt_off00011619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11619 11340 bytes
SHA-256: df5ff33d1414965a9dc9c56eb7f08e1e05347005975b996705f109288e5cbbf4