Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff567525f66c62f…

MALICIOUS

PDF

90.1 KB Created: 2021-07-30 01:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: de8b1fd40beaa1720c1a81c08e1a83ac SHA-1: 3d90427e52af21fb7ed71cf0c10c3cedfb2648a0 SHA-256: 3ff567525f66c62f84a97d6dccf2efbd7cc760c228de06cf0a720d02aa54f934
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=adobe+premiere+pro+free+download+with+crack PDF link annotation
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/a8091034a69519185774e20e5bd2c60c/neniwifofarapezokireket.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a8aebbcf2---nemarodun.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/27362ff26b62e2b996a0da2daab2326e/65496496921.pdfIn PDF document text
    • http://ilkemymm.com/image/files/sevaketagudofobunine.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/93433939988.pdfIn PDF document text
    • http://alohatoypoodles.com/clients/1/11/1122824db0f83c9e74cf39311881f217/File/31101289177.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/fc652b251d328fb650f35c9b3612be1a/junumaxuwenorodixixifu.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-12/images/files/61573333522.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fa5f3403f---nowukol.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/jigamiva.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/89190d7e62426eb393a4d5b7015be43c/semupaguwitivurudebiw.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/61677480441.pdfIn PDF document text
    • http://klpa.net/userData/board/file/27474995195.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/53220758156.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086b698a5d55---27759628954.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/5696269567.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/o0ppbvfjcfrvhfkefrmaj12rvf/53265023740.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/87992650191.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/selurodarutefijasibiz.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161031fe6261fc---tifef.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/otc63m32kklv2kkjrsuq8tc66e/vobiniriv.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/7582750404.pdfIn PDF document text
    • http://amesonsofallen.org/clients/53156/File/98480210747.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_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 17232 bytes
SHA-256: df69115eabb36aac61c350df6e5f2a07a56c29391910e00d19e167ca7718bd45
font_01_sfnt_off00012671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12671 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E88 11016 bytes
SHA-256: f6ce3362423b6334b0d2e9c24d5d244f60d268e9d89c9fbbdee3a3d09c7dde9c

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