Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bbb6d9dd14d5aba…

MALICIOUS

PDF

85.5 KB Created: 2021-07-24 08:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d4c925267d43e6f5e3e9745ec1917ea SHA-1: 5a6d43c3ff069b8fc66c0bd19b28a6f36cfce72a SHA-256: 1bbb6d9dd14d5aba380917a572c53163f859e9db7691808d1f111d8544008c75
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to phishing sites or download further malware. The file's structure and numerous external links suggest it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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 http://naucseto.cz/storage/38054285195.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/2e9fa0d9d160ec262288b27e97ac14b4/veguz.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/93b4081e00d62ab8d9a7ae07caff52e7/kerefojivuwidojafefifaxa.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/329933ba825c3517d2fc7a679c108add/81077476589.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5858bd9b6---tisuri.pdf
    • http://kmsenior.org/file/files/7878669696.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cab16d6f3b---10594768185.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/74567c66d597b1a436e5c9ecd6c233fe/15929612366.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8443323033---mozimakijuworubedez.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087136c2dfb1---wajulom.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37076b8a7a---ludok.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/n45kmrbs2u8nue52ai44e149q8/28653557619.pdf
    • http://agendatourvietnam.com/hinhanh/file/4364276866.pdf
    • http://haiphongcontest.com/images/files/49460430392.pdf
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cbaff325f---43749794556.pdf
    • https://akapacha.com/userfiles/file/26172436250.pdf
    • https://hagabb.ro/ckfinder/userfiles/files/derofeputomokulinalo.pdf
    • http://erdivigado.hu/userkepek/file/fumose.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/61451798e0497fa07b4ed13a1c4d90e9/xewiza.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080faf27ad9b---wefibize.pdf
    • http://tulga.ru/editor/files/49043614614.pdf
    • http://ytbozhuo.com/upload/file/132351449001.pdf
    • http://kochamsushi.pl/UserFiles/file/69484580168.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=104+number+theory+problems+free+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e961.bin
1494b54cb65545d1b0300b7d459d169a42dd8084efda087a15355377566ebe86
pdf-font-stream PDF embedded font (sfnt) at offset 0xE961 17980 bytes
font_01_sfnt_off00011708.bin
7280110224a1cb62f2b347c51d6697d0fa0f8646fbea53716be9993b33fd56f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11708 11020 bytes
font_02_sfnt_off0001304f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1304F 16792 bytes