Malicious PDF — malware analysis report

Static analysis result for SHA-256 f49c28dea1c41772…

MALICIOUS

PDF

89.3 KB Created: 2021-07-15 21:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2d29b0f25f56f61d2275774c0414f33e SHA-1: 71bee383217b01be7d9b44d174ae82d3df8d81cd SHA-256: f49c28dea1c417722d596146e76eec9fc97c95f38e4aad9140b5c741bd2011d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16099b17f9f431---76596780947.pdf In PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095efa88e00b---50349379657.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/jedon.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/6aa85dfff66cdc592293db3a49547387/mavovewilenebevokupeg.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/gezuwub.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/47834935934.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/925881034.pdfIn PDF document text
    • http://carszana.com/image/upload/File/86582383745.pdfIn PDF document text
    • https://digireg.si/upload/sasukefewesetatabenenat.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/5a984ec17937096d42520f6053bcbd81/wizivunujepabaf.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/retesegetamobonif.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/kidibesokatiralobuwonam.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/f2f3790c84d8772fc92b75b82309eb44/bisanuperimosamenunixig.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/1401007698.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/95fc8b0d79a37276d1a627a182dedf00/dapeworafaruzegobulubu.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d77008b94---77921222273.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/80f6c42b63fe5056ff0544dbab3edbd8/36919241506.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4d59981d0---tofosulise.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/92564097877.pdfIn PDF document text
    • http://cecev.com/stockages/files/rumirujexosavi.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/lilanepavabilowegusa.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/91873087496.pdfIn PDF document text
    • https://bczenekar.hu/files/file/11730245145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=best+indian+whisky+brandsPDF 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_off0000fb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4A 10664 bytes
SHA-256: 5201929a8c2541d0b478927c2fc06bac5da409422487f85f71169b0325bac83d
font_01_sfnt_off000113c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C0 16928 bytes
SHA-256: 5d16193efc73770d4648c5ff44629c4f43ea7387a5e4570da5803e6b151fbf4c
font_02_sfnt_off00013ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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