Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7aea5f9b15e925…

MALICIOUS

PDF

114.7 KB Created: 2021-08-10 09:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 29d7925f0b02e652b100735689e03ac1 SHA-1: 584902161dd06c659a02a86c8a9fb7eb78c2b1e8 SHA-256: 3f7aea5f9b15e92585c8c59e6c55af5ef746b9490f84d2b4fad53de3b8d0c847
236 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains heuristics indicating it is a lure for remote support tools and clipboard command execution. The ML classifier strongly flags it as malicious. The document body, though heavily obfuscated, likely contains instructions to facilitate the execution of malicious commands or the download of further payloads, potentially via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • 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://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/eb6c91e8d61f3f102086b30c8d725d43/79364503445.pdf In PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bca21f74172---zumabik.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ee2f8d08b---kuvototupokeforojen.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/46380426123.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/firovezubakolega.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/sivuwapi.pdfIn PDF document text
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/97898687196.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/nubuwopirubetafigonixino.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7074ab6a8---60314526831.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160715d8be5cd4---pakemokabofopabe.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/fotolobube.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/805708b8930ffc7cc4ce6a576ad939fa/ketujixaka.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/xokalurutotewalenifepel.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081506cb54c7---toxutivibuvemorapaxezeju.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/57c7ef14889caf0a16e8c168ca78c8f0/molokosotubexodi.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/u27ub4at0m4e9ir5j9segnec48/wononomonokonidigin.pdfIn PDF document text
    • http://yalciniskele.com/imgup/file/60821500378.pdfIn PDF document text
    • https://digireg.si/upload/mexovipefiluk.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/9ce93cfab51e1f9f1d21023f68a78579/13817403415.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa4498d18---7128131403.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cba6a01679---duvedo.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/tumit.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d093d144344---vijijigunakuxikoxojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+remove+connectwise+automate+agentPDF 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_off0001597a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1597A 19000 bytes
SHA-256: 962c5994896f29a937b15d44cd039f50abef72b961862b4895fef7c13aa0c559
font_01_sfnt_off00018beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BEB 10768 bytes
SHA-256: 1525b6557b373c2887d9ccba4148d59670992f688a2c44adc961676470622e63
font_02_sfnt_off0001a4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1