Malicious PDF — malware analysis report

Static analysis result for SHA-256 2279effec25d9718…

MALICIOUS

PDF

76.4 KB Created: 2021-09-17 10:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50153b06553ee454aff9628cf1149281 SHA-1: df90b856b90bbb755ef7bd1b1323b0e180b58d9c SHA-256: 2279effec25d97180b1a881a4e84df3591f69dd882805d62850e4495dfadfb7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=pattan+screen+lock
    • http://optometrystaprzemysl.pl/userfiles/file/91502132584.pdf
    • https://edusfera.pl/upload/file/46103136011.pdf
    • http://boekenwinkelindex.nl/images/uploads/wigene.pdf
    • http://knupress.com/pds/editor/file/56453253133.pdf
    • http://chieucoingason.vn/files/93494281014.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614407874bc78---75768865943.pdf
    • http://hotelclinton.it/userfiles/files/logenalexifuranutirivubes.pdf
    • https://innovativallatgyogyszer.hu/fileok/file/besulen.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419e8934944---pebosulikagakawusik.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1614115b6dc09d---tidajomisirewelusofi.pdf
    • http://analhospital.net/file/files/4907471255.pdf
    • http://nato-denkmal.de/uploads/file/70769210253.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/62998e5e2234755e90ce2ba46ed81f59/zidedutipuwewavafefitam.pdf
    • http://foto-klub.dk/userfiles/file/zobowusumomelafanag.pdf
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/naxabotapagamonuzeko.pdf
    • http://runbo.net/upfiles/files/16304829783834.pdf
    • http://igigeothermal.jp/userfiles/file/23897041343.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161398767b178c---kodupalujijoxosifikatat.pdf
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/levujatadamofanomadizumis.pdf
    • https://drlalashow.com/php/billboard/uploads/file/kuzenutudi.pdf
    • https://nguyenthelong.net/userfiles/files/mexeruvowurimib.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c55d.bin
bbba5f000dcfa4fa1bf7f0db59f267af28dbcb487139636c33db348cb665b936		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC55D 10224 bytes
font_01_sfnt_off0000dc81.bin
9230f2cb071efe972c63ab18794058619105ad51dd947c58b1296fc613bcc45c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC81 18144 bytes
font_02_sfnt_off00010c40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C40 16792 bytes

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