Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e2b9fa2dc500b74…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 01:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ac6cf030ffdc59634910aac26f612bb SHA-1: bb873474243b915cf475f1d3fd18d8676c11919b SHA-256: 0e2b9fa2dc500b74d8860d5bbb156f912ed91358bdc0ad7b165ca9dab8620c96
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 used for hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://infrive.ru/uplcv?utm_term=mooseheart+child+city+and+school
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612710d3480fc---87303872810.pdf
    • http://khodahoanglang.com/admin/webroot/upload/image/files/kosemosiw.pdf
    • https://imagebeaute.fr/userfiles/file/talepinumazirutaxopa.pdf
    • https://netwindowvn.com/uploads/userfiles/file/xosipukokedexaf.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084598d9e5e1---mojolawajofiwepugelesanu.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/eb24b762f7d6cf9071bd7e527f5793f2/mudelaputiwopur.pdf
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/febejokogurenefig.pdf
    • http://godsownproperties.com/userfiles/file/giwisuwit.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bbbb9366271a66be94ed6111e0a35020/67678291125.pdf
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/giwejegowoviseful.pdf
    • http://artdealer.vn/upload/fckimagesfile/cccfa13f14e4b1e7f5247a9494668486.pdf
    • http://hoshitorionline.com/uploads/files/kisebekimozupabilenagutiz.pdf
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/zudutivujiv.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d0ffcfcb3---35018401914.pdf
    • http://apluskleaning.com/admin/images/file/69482106198.pdf
    • http://brcassociati.com/userfiles/files/wedijiwok.pdf
    • http://glamour-nsk.ru/ckfinder/userfiles/files/lolusupitorudofukoxolo.pdf
    • http://cn-junsheng.com/upload/file///202181718467779.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ef7e2ab31---24622832829.pdf
    • https://dm288.com/slicice/file/vufejoza.pdf
    • http://adance0112.com/upfile/editor/file/65102821303.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16087e5942aea9---87738643920.pdf
    • http://petra-dario.info/upload/datoteke/40990603815.pdf
    • http://ladyqueen.it/userfiles/files/sisijox.pdf
    • http://feg.vn/uploads/files/razemufategidofu.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084928c92175---zabogififajiwasafapabal.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_off0000e218.bin
39efcee4acba025edd8fd9e0573941b6a3b7f8dfe4089caafb990e7681ecfdb2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE218 10576 bytes
font_01_sfnt_off0000fa3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3A 16792 bytes
font_02_sfnt_off0001124c.bin
2fb69983f70054ae31906678e0f305c8fe957ccef31a192d5074a93caa37f3f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1124C 16752 bytes