Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b001af42a9df77…

MALICIOUS

PDF

57.5 KB Created: 2021-08-28 05:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 394162cedd6e1e04c24993b534d2f7e1 SHA-1: d88411d0e0ec6c51f350233869e2750964c5de04 SHA-256: 39b001af42a9df77e3a8fa1bc7b74c7b9f8656d82de79313bfe1aff3b746d952
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8980

Heuristics 4

  • 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
  • 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://irlanc.ru/uplcv?utm_term=tds+220+service+manual PDF link annotation
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/23281721675.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af71705928a---99559925530.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/49396865361.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/0a3fd1a4993e48d341d2ad5765ade949/niridujubelege.pdfIn PDF document text
    • http://canvangdientu.com/images/file/mipotudofamatebadu.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2bad14e1d43e429ae4e266a8ff1ae578/55270334492.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609215a008542---zepudutavugesozazimiwuxos.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/zuxupug.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/tulineto.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/aqaigked840ve0lckipo5d10o9/26419183312.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/5004086ac01ec61cc033ca909e84caa3/zekenatezubixun.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d5574863a---79767563337.pdfIn PDF document text
    • http://bwc.lt/i/48188407809.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/52041452060.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/xadevokudonepedalaxoneze.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/bovibemenogimikipowo.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/14046749932.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f9ab0a1c5---32668637527.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/17588696010.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/99231632001.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/32990163021.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/vuwipanukirefuwoxid.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0d1ab6eda---woxikoditapubopi.pdfIn PDF document text
    • 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_off0000c76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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