Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd22543653390e9…

MALICIOUS

PDF

85.3 KB Created: 2021-10-04 19:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8b10e872b43b5caff28abddcd6c434b7 SHA-1: c5b4413744affaa0184a41cdfcb948f88c2cfac0 SHA-256: 9dd22543653390e968f2d94f522d5f70ae66cc881d0a8adb786d23cd2ebecad4
204 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a link farm on disposable hosting and a detection by ML classifiers and ClamAV. The presence of a 'download button' lure and a 'password-protected archive' hint suggests a social engineering tactic to trick the user into downloading a payload. The embedded URLs point to potentially compromised WordPress uploads and other suspicious domains, likely serving as download locations for malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://catamma.ru/uplcv?utm_term=inventor+2018+professional+download PDF link annotation
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/56697082623.pdfIn PDF document text
    • https://khanikango.in/file/72483028492.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161371e3504e51---97669218708.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/papumizijiluga.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/simomujorob.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2e6a3a949---33347829163.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/dufijeg.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/6325460891.pdfIn PDF document text
    • https://vpmemorial.net/images/file/92114806232.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/86597913253.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/xenaxenitarazifepi.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/68055959823.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/39038296091.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159023d23a72---82749295991.pdfIn PDF document text
    • http://hijoin.hu/editor_up/12956930358.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/3316128294.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/ekmov7eh0mrop0bcaqhgod8nm9/nuvenanaxigelowesebe.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/37706144742.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/85b5abffc67177814966733c1c47e0ee/pezar.pdfIn PDF document text
    • https://slicktechproducts.com/newerac2c/userfiles/file/waxerudowafofixunuxoxurez.pdfIn PDF document text
    • http://4bx.pl/public/file/susineris.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/siwowenogele.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_off0000df82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 20724 bytes
SHA-256: 48feafd342e70814d61f2b2a3a4a7b8bf8cf2d120a63833fb24014eb919b2cfa
font_02_sfnt_off00012d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2A 11096 bytes
SHA-256: 3a5280441032b5b3da25e1acb1a4a06d9be80227faa0d9dccc67c32249301d79

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