Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a9ab5d6c12c9d5…

MALICIOUS

PDF

84.1 KB Created: 2021-09-23 09:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: abaad6705f70fe83544e64eb9202b093 SHA-1: 1abdfec07f084f4c349528eca0fc3c59dc2b03d1 SHA-256: c9a9ab5d6c12c9d515ef34e00f281dd44efed75a9c03d1a0275f652fb8d8cd5f
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external sites, many of which appear to be disposable hosting or compromised WordPress uploads, suggesting a link farm or phishing lure. Notably, the document includes a 'Clipboard command execution lure' heuristic, indicating it instructs the user to copy and paste content into a shell, a common technique for executing malicious commands or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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
  • 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://crewmak.ru/uplcv?utm_term=back+to+the+future+2+torrent+download PDF link annotation
    • http://gzafjc.com/uploadfile/files/koxusukaxolul.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/foremimuwinewojerosux.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/fenitatifigivivenodipenub.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/95356305449.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe3d1b990a---lokevikejimevofufuzab.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/salemazolagumigege.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/42885437988.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/13754639853.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/pomusiwereb.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/zawavaxiginajafelomefoz.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/lonom.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/7728253385.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/buzidusixi.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/47838717280.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134c3a344a77---85846530265.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/fiferuwububu.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/86947924691.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614831e8028c6---begawakasa.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/zokoziwanovusaxiwegezowog.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210909172246_2099082502.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/tekoposus.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/revutanoniwovoxotewufibe.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/631df3bcd93289783657aae4fcff6217/welilexikevizapiju.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/18971009027.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_off0000e2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C0 18280 bytes
SHA-256: 1b0a55724c6c6f0fc2b48814efde122064e122b5bf8625eb621a847921bf5180
font_01_sfnt_off00011178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 10764 bytes
SHA-256: aecb86c7690888180940133705f1f04866960b20a9fb8a988e722b54aa100e69
font_02_sfnt_off00012a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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