Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb2114b5b3353dde…

MALICIOUS

PDF

124.4 KB Created: 2021-09-07 23:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b603ef93d00d6383901e8112f910028a SHA-1: d8cd04c2f04be61551c5fd6f32f3cb65b3f46be8 SHA-256: eb2114b5b3353dde70a9d09fdacd66090c5daf56eff3a165b8a015cfad3410a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of a malicious document as an attachment in a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/jejepijaje.pdf In PDF document text
    • https://paperland.bg/uploads/file/noxagitikax.pdfIn PDF document text
    • https://emmaushuis.org/pages/nebakulalokosagowesolo.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/luziwunarezajuderujiw.pdfIn PDF document text
    • http://lakes77.com/clients/47041/File/22434889071.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16075e98ab9118---26028646885.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5693c5427a---zudunegalavemiga.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/c7880d2f08221c4ffc0d6f6f3cbc0757/lixiruzijotoxupineze.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/47150944432.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/36330050831.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a705d761843---remowukenol.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/d0d97ac7261a31e841c0c69a0329740e/bozozogufamuredadefogeg.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/87c4cd38c642fecc77a80fb7c0b660ac/bepade.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/divotorobatezasumud.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/42d3f4d772001736af6382900e4517e9/26067651172.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/ruboli.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/85751676006.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a198515e8cd---23214651772.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/kifarunirupaven.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/84305343094.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/pauj996lt923qgh473j48utu14/55023349864.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/xexokezuvupasapugalokadet.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/100e7937fc01f223211b2dc15facc48e/lawor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=modern+and+postmodern+literature+pdfPDF link annotation
    • 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_off00017afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19310 21636 bytes
SHA-256: 10babcb8fc57efc51560a943aa79174a617cc839ab2e5206b50517d557749e62
font_02_sfnt_off0001cb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB1F 10752 bytes
SHA-256: 25811e7481726d87f147c281a1b639603e2b27fb7c31f5e4794b347e07babb3e