Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8edbb49d811725…

MALICIOUS

PDF

73.4 KB Created: 2021-09-25 09:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2cd0de87fda4379fc5d53dd1f31cb0ab SHA-1: 6b24601c56193025a8711776a61051d03d78e52a SHA-256: bc8edbb49d811725dbc38a565480c6f664292c1a86eb0c8afbe6edc3015e1afb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised websites, indicating an attempt to redirect users to malicious content. The heuristic firings suggest this PDF is part of a link farm designed to host malicious files, likely for phishing or malware distribution. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=gamev6+among+us+online PDF link annotation
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347b57b80ff---mezenuwizolakozebeke.pdfIn PDF document text
    • http://hoachattn.com/image/files/lerujodireremiziger.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/35382567964.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/miripijixebosuk.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/25496756688.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/xavetirekimuvarubo.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/27096846502.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/dipexexoxakisis.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/paganapavesazuramuxur.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/6228649073.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/38609848961.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a2191a4df3714890104b7e41b5c49b5c/liwalogi.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/46157156218.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d6ed64272---55901320581.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/josomazunuparerivujomaji.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/30080910578.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/rorirudeged.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/pisatixewebigop.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/vemoxavogatufafilijozub.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/83733983203.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/10767407348.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/26376386599.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/pebakilezazisazaz.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/10660579476.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_off0000b82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB82C 10624 bytes
SHA-256: eca88d7665b05b0aa884e0b1b9e513693df4b8b46e0b1eecea742d6f75ff0832
font_01_sfnt_off0000d082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD082 18400 bytes
SHA-256: 4cb54053a7358b7da2369e96b3235d4f04d5bdfd5ec0d6c98918dcaaf72c772c
font_02_sfnt_off0000ffe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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