Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18af82473d75782…

MALICIOUS

PDF

93.5 KB Created: 2021-08-12 06:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 592f29e8be04f0245d5050e5c2d20fb1 SHA-1: a6c97eaab9abad8a1e5213b2599aa13598c46aeb SHA-256: e18af82473d75782972437ec4092f96f7d77c60f43417d007f5b796850e3ecc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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 http://aven.su/userfiles/file/90120766122.pdf
    • https://gegeny.hu/uploads/file/gipabinemizinapud.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdac7a77d9---65553862374.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/3d1698b7d70244c25835e38a9992a2aa/46366019615.pdf
    • http://sungsam.net/userData/board/file/57985888200.pdf
    • http://cosmik-kinoteatr.ru/sadm_files/fawiriginewupunewu.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/f5tcbsfgucr57roesfevlnrh9o/45720041498.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b8b492ad3---migijizomil.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/0413db06e5ae528ca21d2c4ed592a9c3/93293256993.pdf
    • http://rollfactorytogo.com/uploads/files/61252746426.pdf
    • http://botosani.ro/img/uploads/file/590861678.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/d34a96420b50fe36929629cd6ae541f2/64774555506.pdf
    • http://mkngsp.ru/upload/files/xazugilawesazum.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/79338241848.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/oium8r3vggftjho2jivkk1smk3/muvatupawepodap.pdf
    • http://torgoborud.org/images/file/67815650898.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/33311911249.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d61727b14---23694205423.pdf
    • https://fsbulletsandbrass.com/userfiles/files/rekedebetotixininudevoz.pdf
    • http://apex-architect.ru/images/file/73951428870.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/45f2f5705b33ade2cc017a76126c3e21/velurovirinosak.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/0dp1eglihj3a9hoek32gl41l3r/nisogubusotima.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=lucky+block+mod+1.8+9+9minecraft
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e84d.bin
a013ce2342554bbd70a9f85285a6053b67e9b25eaba0dd22223cc179b1b1ea16
pdf-font-stream PDF embedded font (sfnt) at offset 0xE84D 16064 bytes
font_01_sfnt_off0000fd61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD61 16792 bytes
font_02_sfnt_off00011578.bin
249e9279ccb291ceaba9c6f459b5beb149b768e2d856f59cdbe1bdcc88ee7ee6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11578 11364 bytes
font_03_sfnt_off0001304b.bin
9292f8177b1fae08c6ab2e9bf33d6c0862c35ed67faa67dea0b7362fc711455c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1304B 2252 bytes
font_04_sfnt_off00013a65.bin
919b91a5167bfad28e45539efdcef4be87e9289868ab217d30e405d58cdf31bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A65 17312 bytes