Malicious PDF — malware analysis report

Static analysis result for SHA-256 7406a409b5a79a59…

MALICIOUS

PDF

161.5 KB Created: 2021-06-28 23:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9f7fe5fcb07f441d218a8b67cdcf79c SHA-1: 9161f69b676c58efdd259f0c16f455ef5de3ef2a SHA-256: 7406a409b5a79a598633feb998f0294f86e67482bd90c29e4bf8241a9fb0e591
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites utilizing form-building plugins for file uploads. These links are likely intended to redirect users to malicious content or phishing pages. The ML classifier strongly indicated maliciousness, supporting the assessment of a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • 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://krisoc.ru/uplcv?utm_term=i+am+getting+confused
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071d456cc5fd---foxorejumozuzivub.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/a945c6d58d5c33aa7f91c2d6f44b9fa4/45193810984.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081baf54810c---82840558954.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b41e38caee---53893865485.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607321cdcc330---25943073332.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/1nd9kelqlltmlp4fl0kukks2p4/xoninemi.pdf
    • http://technoculture.cz/admin/upload/file/bapawexavomufaluvisitev.pdf
    • http://hysansam.com/fckeditor/userfiles/image/rakasivodabibezovobog.pdf
    • http://driscollandgibson.com/images/edit_images/file/75168977950.pdf
    • http://ainut.fi/userfiles/file/13955270088.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9492119ca1---vivomarap.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/3236dad71015bad57d121f24aac9a96b/75481891363.pdf
    • http://dfh-consulting.com/userfiles/file/84742015430.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a1df95e3ca06b9ae31be6b80bf9284c0/padomifirikejojawi.pdf
    • https://daaeportrett.no/upload/file/20312950736.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077fd7762dad---81702448452.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bae3763440b---melunixosudulimomipat.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec9cce1d90---veropoxosub.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/6b3e6f100b8ef6ba7fb88b019226f084/68527209754.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be214749993---puris.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_off000215f6.bin
c42c648328c83d07521f0c3697927ca4f6e2c4e31aac53acacff3a9fe9e77711		 pdf-font-stream PDF embedded font (sfnt) at offset 0x215F6 19100 bytes
font_01_sfnt_off0002487b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2487B 16792 bytes
font_02_sfnt_off00026092.bin
263d5cb34a34d5719e3d3a9c4402571e3b3e17750fb58cef451069d6ed48c178		 pdf-font-stream PDF embedded font (sfnt) at offset 0x26092 10724 bytes

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