Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9b8db36feae19a…

MALICIOUS

PDF

84.6 KB Created: 2021-07-04 12:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0710278e1dd2b509b978aaa56623be27 SHA-1: fa651e126a5e42decc1482fc958cc310313d7111 SHA-256: be9b8db36feae19a6fcca12ed21a107d48ce0f9d8a96215ca5a10bf4149f67a9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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 http://3e-recycling.ru/app/webroot/filesfiles/68467255674.pdf
    • http://bsinteriordesigner.com/userfiles/files/vuxodibujixoxesa.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609884347702c---86584049625.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076baa505030---26838291998.pdf
    • http://hotelbelleepoque.bg/userfiles/file/xokegekilevowusizuja.pdf
    • http://aite-materials.com/upfiles/file/dirigonute.pdf
    • http://taiwan-casters.com/userfiles/file/vedutawap.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b622486618d---zidisovo.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/0vp4iktp6je0ca0jjvumd9mcta/muxinedetovobogobut.pdf
    • http://dothanhigh1970.com/clients/6/63/63ba8bdc6fdca46b25bb56d5732eafc9/File/48500209252.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fe2437419---99444549390.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a165d34ce1866e83a1fa0dc00e2366f6/14499740835.pdf
    • https://vivaldiroberto.com/img/files/mediafiles/file/fomiraxokop.pdf
    • http://dothi.info/images/files/30181837969.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d22c833fe9---jafogopipobidav.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b0835f5a316---xuruvasaxodiduzuluveleno.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/c5e86279ab0db00efeee01e66e150162/kenufutatu.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/a78bb94467ff9990cbe2b88fcd6d296c/28645057118.pdf
    • http://renknh.com/ckupload/files/66841572918.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f16d145d5---bometugigubo.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/slt19o980b4k7lkujc4hss43t0/73813977972.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85c073b93e---wakobusomasi.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609434f646069---76652094227.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4ce64c5cef7e8c48f5c76eef27c4bbca/25220407025.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=cat+meowing+a+lot
    • 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_off0000ebd3.bin
ae9e87761628cef140bb3fb2fbdbd8b3ef982a13542b0da730c0a5ddbfca663e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 10300 bytes
font_01_sfnt_off00010310.bin
30e305df9996296b920673e9cb3ed302128f69d19ea0bf6df85c0b591a345078		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10310 16624 bytes
font_02_sfnt_off00012dfb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFB 16792 bytes

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