Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ad7b492de9831f…

MALICIOUS

PDF

70.3 KB Created: 2021-08-24 06:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cb9744f3f28cd636c38b39cf1b328df9 SHA-1: 32e57edc1ba068fb1f7bf6a01c14b800b9bcb884 SHA-256: a8ad7b492de9831f5a6a7b6bc609269e30a405f1787587d7ab1b580f43c45e38
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or redirect users to phishing sites. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9372

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 https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160925590d424c---savivonunotene.pdf In PDF document text
    • https://telewebmarketing.com/FCKeditor/file/10290811682.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/loluzamesobukuzopebaz.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/339bf3494e3ac44c5ddaa589a6aaf0ad/befuxinapomuda.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/fefupiwalotok.pdfIn PDF document text
    • https://micsys.in/userfiles/file/92191480628.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/cfec17037cbb69bc5c9df18c86b5d8a1/digevope.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/tazogosoxotatofo.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/e837f576c5d7fcdf8c799bd6c0f67b6f/fexegomenizojid.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160810d7accc2f---54651643731.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/mikata.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/26549992235.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ca307cd0eb0b96a6f2f3f33321cc1242/ranakosogopamagulise.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086168766b16---tabaw.pdfIn PDF document text
    • http://shield-in.com/userfiles/files/64012810340.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160beb93238e5d---12353515379.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/v10pfkgbhigtef6rojb0nv800s/nenuwixilanur.pdfIn PDF document text
    • https://htddienstverlening.nl/userfiles/file/rasuv.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/60691160201.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/3de90ff150ae970b1ec0570573813b69/tatefotetesisev.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ncc63nlpki0gdlj6vmrmcqt3ud/74689911714.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/18f58a3a227ed350a5ddeac52b8f9fce/kabiporeliwaxoxuxej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=top+english+acoustic+love+songs+2020PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE528 10924 bytes
SHA-256: 101d4393370682cdbb16df5a544d6d7c64bd4a17576c219dd6a07ed20ab943de

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