Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4df3ab5cb1af43d…

MALICIOUS

PDF

82.6 KB Created: 2021-07-08 06:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b7ab892cbc39e7a50f01b3c6e9ef7d1 SHA-1: 796819be26d3e9f6a00ed1fbe2e0f6a3578321c8 SHA-256: d4df3ab5cb1af43d17e29087f337722411aac89070005d99fd436848bbd307fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns align with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://ludifrance.fr/userfiles/file/berunezosasexafu.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/97119f7700d1a0c022560d2be2c1ed85/52222331303.pdf
    • https://stmarys-perthamboy.com/upload/File/nipip.pdf
    • http://healingtown.org/userData/board/file/58221384508.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/hls828vviq6oblr3709jtp3fid/81585696454.pdf
    • http://upbfassadenbau.com/upload/file/57089015798.pdf
    • https://serwisnawigacji.pl/userfiles/file/49340131118.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609abea581d2c---28213910512.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/8ab81eadafc1f474b23fe379c6ac8bd1/gakexugakolegojadexudiku.pdf
    • https://ancoraeducacion.com/images/mepasalelanikotoxud.pdf
    • https://iwnta.com/userfiles/file/41889497779.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f80ba120ed---roxedanuwaxaludowom.pdf
    • https://actaviaserica.org/board/file/files/doravaziwusajuvutag.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2e9d413f5cd9402391f08d77ec901e55/losojo.pdf
    • http://etcad.net/np/upfile/file/51097739735.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d825a4b33f3---pafesilotij.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097fc023335c---34907030586.pdf
    • http://dalaichau.com/files/davarenedovoroxa.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e21098d472b---74579724700.pdf
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/530fd035c733339d7e000a2d34444878/luvelelelugipejarifazaji.pdf
    • https://charterboatdeliverance.com/uploads/files/26163569226.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=answers+to+american+pageant+review+questions
    • 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_off0000df43.bin
781cd63875242382e9cb012796fe327134e9d0e519d3a97257c5992cfa3d3ee4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF43 16964 bytes
font_01_sfnt_off00010b8d.bin
f62990ade4cb834acdf7a39ca5d4f466fe64ba4d2610daa98d3f8ce5a137a145
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8D 11048 bytes
font_02_sfnt_off0001251a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1251A 16792 bytes