Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf2745d8e74545c…

MALICIOUS

PDF

88.4 KB Created: 2021-08-06 19:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ce53b7cd8abb6d347123b9f3e59fd052 SHA-1: 13752edb2b445977e70acc4ebcd8a0262733e5f9 SHA-256: 3cf2745d8e74545c3d3f86a8d175ad4336ad4d9299e312e6c4def519affeeadf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains a 'clipboard command execution lure' heuristic, indicating it instructs the user to copy and paste commands into a shell, likely to download and execute a secondary payload. Numerous URLs are present, many hosted on compromised WordPress sites, suggesting a link farm or distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://karlsbach.de/userfiles/files/23261074605.pdf In PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/eb82c4b07fbd915aafed768f6b324eb4/10567783887.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609448fc32019---mutifawugus.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/xirexakikogaxovedudug.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100292559d73---pimotaxi.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096be677df60---88832168346.pdfIn PDF document text
    • http://livestocktool.com/d/files/nepajexesazamuwapivepu.pdfIn PDF document text
    • http://ibb-online.ru/f/file/konefeju.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/ej5dgi7iael6prda2jsglsllp4/miguwajenuledotitijof.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/utqajhro399d1071772flg90g1/xurojafurevusafuli.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a3067ce33---kafowibatujesem.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/0369c7fa670b35989e4800db85bdf374/43269321983.pdfIn PDF document text
    • http://somogroup.vn/ckfinder/userfiles/files/341438063.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/53714691095.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b629bc5d92f---4486027843.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/222bee3655ac9428347ee4f00a97609b/lututeges.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081016c7c6f4---17508124927.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/74548240938.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/40022484249.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/48091674166.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f773cc9595---bubegurevi.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/66524438641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=microsoft+office+professional+plus+2013+product+key+crack+32+bitPDF 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_off0000f237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4E 11520 bytes
SHA-256: 2072acf666bb9d3f317c2101621e3ce9bbf89011e72196eb8f02bd55ad31aaac
font_02_sfnt_off000125a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A5 17264 bytes
SHA-256: da054ced6ab083ae648d229e657ad980279ce70db2e4d779785d065c25dcc54b

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