Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0793b11454fb1a…

MALICIOUS

PDF

70.3 KB Created: 2021-09-18 22:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 12bbfdda50e81600680cedf16a986001 SHA-1: dac16d732acf4c8792c0c1b1959516135397f80b SHA-256: 8a0793b11454fb1a8a979b923f74dcd773221cde0f57acce38999149c9ae0937
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. Additionally, the document features a link farm with numerous URLs pointing to potentially compromised websites, suggesting an attempt to redirect users to phishing sites or download further malware. The presence of JavaScript and the link farm strongly indicate a phishing or malicious content delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4270

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://elfuklid.cz/foto/Image/file/9303733300.pdf In PDF document text
    • http://turchifiltri.com/userfiles/files/sapumofilemogovarite.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021921314399629.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/22406964539.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/88575780908.pdfIn PDF document text
    • http://klenderbio.com/upload/files/dobatisufubes.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161408ba0cec2f---buzarit.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/76500058229.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/viximikabobakuseroxorav.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/42679500793.pdfIn PDF document text
    • http://tavio.su/files/file/67676509140.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/liralobowepozifobetagur.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210901_493F295A712B8353.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/dafib.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132eba6c63fb---patalerasuxafufa.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/96a7835365b2c0b0c8b09a67748acf38/vidajiwukupatesojapofimu.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/54366599286.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/74261345828.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/89803348352.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/zivefegulegisobaji.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210917023241803128hrvli.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/14162810158.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/78515483504.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///75318256251.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/piveloteremalovagegamop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+merchant+of+venice+xavier+pinto+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC466 17784 bytes
SHA-256: 37250cdb010f444dd9363b28f6757666ee4470d60cd55c304c1a290cb4e2c791
font_01_sfnt_off0000f255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 10804 bytes
SHA-256: 5798a822c125753f014f8520c870487b6d67979ad9a5f17a5eb38c6d7cf34823

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