Malicious PDF — malware analysis report

Static analysis result for SHA-256 511d61b518e3cdcf…

MALICIOUS

PDF

119.3 KB Created: 2021-07-17 10:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 05f4e0bfddbdbe5af39bc02ae540554b SHA-1: d53b07d70f3a3e7413449686a130ff50b5f75ef7 SHA-256: 511d61b518e3cdcf3da60a519cb82d127c4f658b5b120ab0ef7eb54700c68830
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing an embedded JavaScript stream, which is a common technique for executing malicious code. It also features a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection further supports its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3450

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://erdbau-rauch.at/18795694818.pdf In PDF document text
    • https://africanresearchcenter.com/userfiles/file/gowulewemivojijazanagiw.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/kosigafo.pdfIn PDF document text
    • http://chromavials.com/d/files/gekegifigatovurep.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/75bf14f6dc0f0eb39387c8e2f79858c2/44084041531.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/75891757533.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/lajebira.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/74129623219.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/gifuwovowu.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/25888526229.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/4b2cd99d837513b421a2ac86dd121dae/90341800832.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/r4vtf3ueoo9qasjsdkv3ml93dh/zikutojuvamugu.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/92434582241.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/b5f722a648516f76237edaf3e9da7168/32196050686.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/09364e68bf413df31dfbd3f1072ce9b1/49648368810.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a02b4f549d1---15249456169.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/robafikekatotagikak.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/satinevatoporakodivewur.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609687b7dff35---59256322174.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/2dh0v86vsrn3nht2333ase4v1s/mitozawetifupigalugu.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/a3c0510f60c54a3a8aecc8b5496b4b23/lerasofupamenidoguxaluko.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/lobimezemozawila.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a3589a3e283---nudojuvavilizavedip.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a672113a309---59413660536.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/36480216864.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/1c378930098a0b6cab7471045cfe878c/goxuzuje.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/lv51c98ub3cd2v66njvvb89rk7/31540400219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=a+simple+token+of+filial+lovePDF link annotation
    • 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_off00015218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A2A 19528 bytes
SHA-256: 4611fa1b6f882ee3958dfcd0342e3aaaa36452bf6d49013fac247e53e073f324
font_02_sfnt_off00019a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A6A 10560 bytes
SHA-256: f79f5afa48961b53737f8e3da134e87dd197195254192801c1cff5d947e91f72

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