Malicious PDF — malware analysis report

Static analysis result for SHA-256 6606ee4e6fb4da03…

MALICIOUS

PDF

86.0 KB Created: 2021-08-10 03:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 54800306f97774e357a1e3b255d49b70 SHA-1: 4ac37c6273364c5dffe0bc43c2022a37684dfdd1 SHA-256: 6606ee4e6fb4da035c6d1509edce96424bb6e5077fc049aee3463221f9129540
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1105 Ingress Tool Transfer

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains embedded JavaScript and numerous links to external PDF files hosted on potentially compromised websites, suggesting it acts as a lure to download further malicious content. The presence of a 'remote-support tool lure' heuristic strongly suggests the document aims to trick the user into installing or connecting to a remote access tool, likely to facilitate further compromise or data theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://leakefamilyreunion.com/clients/63964/File/80463230230.pdf In PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923b8482573---99572252049.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/f6821cb8d39ea52f29f9b9566b337cdb/42111284783.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210625214928.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05e9b7eaf6---86782840597.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/a5ecfb480ffd35adcd9434eaec3781c8/dotasizifes.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/lixalil.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/zilugetimuxumozivosuxe.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/gd37hqgpt7g1iboijhgnegfint/zudefuwajopetogokenotez.pdfIn PDF document text
    • http://apsons.eu/files/file/84787643931.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/249f7f432c17b0acdea0725368264e15/kamovibok.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/54389569667.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/28447410085.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/46398429423.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab5968a2fc---53721978660.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/19072687846.pdfIn PDF document text
    • http://belst.by/upload/file/64203937642.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/91641352335.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/33639020505.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/wajazowaxeditodexupew.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/7ciklmajifprgmqelnpshl2mk6/sixiwunubinizeb.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/163a824f00d720a1c6919df592f6511c/taretaruludip.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/nakuwebixudonukobobogope.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/xofoziwazevegurerowu.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076d88bb56ee---nanikufeborojizibobev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=canon+lide+110+scanner+driver+for+windows+7+32+bit+free+downloadPDF 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_off0000e771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE771 11308 bytes
SHA-256: fe0c2bf695d02b9fede6c3550fefb4c5cfe775425c56fd99931b96b2e470b3f4
font_01_sfnt_off0001025c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025C 17848 bytes
SHA-256: 5f73d6113a97ed19f55375c1703087ef00b064c81e79d434f3265fb7cfe37244
font_02_sfnt_off0001310a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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