Malicious PDF — malware analysis report

Static analysis result for SHA-256 a692db1c8d107a75…

MALICIOUS

PDF

99.2 KB Created: 2021-08-03 07:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ce063351190c59eeae6024dff436d8a3 SHA-1: b8ddd8db69936332bafd725514c850069db8e86c SHA-256: a692db1c8d107a75083691b26ccdcce477dbf0765d7619cf0242ea55a9f6dd7d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing. While no scripts were directly extracted, the structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/e7a438db57160ad146db726093c43ffe/19937885293.pdf In PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999f17b915b---balowojijurisazun.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/foevree0991erahl1gfeu0j04b/55283689978.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/gejudojilosukalam.pdfIn PDF document text
    • http://maihiendanang.com/uploads/image/files/92986302092.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///93229763150.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607030ba7321b---vadusajituf.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e60b985e29---36486727092.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/69470120911.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160d7fb0305de9---bikupisu.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/8f890d1557feaf50d07b86122de0a0f1/6738312435.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160acac410d7f8---80861732882.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e1853c08cbf---zibig.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/fafebenuzuvap.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/87335399083.pdfIn PDF document text
    • http://rilta.net/userfiles/files/fofuxidi.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/4fed48967931e2a2b460fcdebe28514b/godofufunomufawaneguka.pdfIn PDF document text
    • http://axwelindia.com/uploads/23140327573.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d3bf6cb13---kenaje.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/mepaweti.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d87dd874ab---zupivopebareman.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/menevifezopoxi.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608496c25db8c---kudenuzazoxezir.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/71150470317.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1644432547---74509841461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=manufacturing+process+flow+chart+excelPDF 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_off00012063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12063 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001387a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387A 11040 bytes
SHA-256: 8f594d6c9fb8fad9dc1c114303d2fda34763668fca850b6e4fa05a39b2a2f670
font_02_sfnt_off00015230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15230 16984 bytes
SHA-256: 51948fe3b054f2e360fb9021b528f866b4c4ec6ae04a96ea2017fd73021fd04e