Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e524d864e184dc…

MALICIOUS

PDF

101.1 KB Created: 2021-07-06 20:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fb82d99cdcb6616d82450a85035cc593 SHA-1: 0bb505f301cea2b5dd5d08286ccd013a42947a77 SHA-256: f9e524d864e184dce1749438c0a581af2d4116c699a2ba199c8c3b0c84faec59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to obscure the ultimate destination. Heuristics indicate a link farm on disposable hosting and links pointing to compromised CMS upload storage. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious, suggesting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://huntic.ru/uplcv?utm_term=piano+apk+download+for+pc PDF link annotation
    • https://gruntbudowa.pl/files/file/zazubojezabipulazegenu.pdfIn PDF document text
    • http://deauville.ru/files/file/66071497856.pdfIn PDF document text
    • https://silverwayshipping.com/userfiles/file/lipubikirenijorisaxe.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/97713112092.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608041a7c0f67---wexogoko.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acfec4e86c2---reruzadurojeriw.pdfIn PDF document text
    • http://cl-pub.com/files/files/dudop.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef4d377edc---41807663088.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021060907045799.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/bebiketifisego.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5c3680781---91598273666.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ee1126e50---dodomuku.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/9ucld84mfv3pde8ejjtn5iaikv/73532440549.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/839a067ab36015f6c9cffd1f2a357c06/90135092405.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/1a8ffc754771938b19ce7ef7632e4929/43892995211.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/favigefizozikuweworasi.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9078cc8843---41887003628.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/kosumupefoxojixepexalaru.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872af242430---85022792989.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/28033f2cd4538ddd2fb81fb0604df34f/misixapovuxatibadal.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/76214933933.pdfIn PDF document text
    • http://cwesp.biz/upload/file/4931801668.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/583e7ec058762192f04b42ede29d5fcd/levedotibemi.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/c4de063879b49233d0a05f70ab5e0709/82584479482.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8edf43be2---dikowininemubetipusego.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C70 10392 bytes
SHA-256: 12fdb059ab658f27740a1dee78ea77763c1dc52a112069aeac4a2985eb5d65fb
font_01_sfnt_off0001240d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240D 18096 bytes
SHA-256: d66a9e14e65a227b76386333a0f846093887faa97d04da561c3afeac9227fa36
font_02_sfnt_off00015452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15452 17448 bytes
SHA-256: 7253002bc92d30a33a52f6bb87818a6913b76e8773e4801a9291f0794c086f8b
font_03_sfnt_off00016d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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