Malicious PDF — malware analysis report

Static analysis result for SHA-256 de15b5b20af8cf28…

MALICIOUS

PDF

149.9 KB Created: 2021-06-27 09:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 741a1ddaa99156c3e4af1dfa00541625 SHA-1: 0aa5a4e56bccad5927811fce424673c6273742e7 SHA-256: de15b5b20af8cf2802c27f9d12351c4cc9c7178698d1477af14f224755920cdb
154 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple URLs, some of which are hosted on compromised CMS upload directories. The presence of numerous links on disposable or compromised hosting suggests an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7839

Heuristics 5

  • 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
  • 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://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/14269b03281cdc0bb50c0acfef583586/gukimagefa.pdf In PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fe2671b2b---nulamuzupazifububujite.pdfIn PDF document text
    • https://purefeeling8.com/data/file/38843231189.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/fe1092647f5d70d207018b646ecc2ed0/sigino.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050210443694.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/2636674588.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085edc7e624b---bawomixiforurize.pdfIn PDF document text
    • https://davaocarrental.com/images/file/lobugabetadugawisibes.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/30150335116.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bcdc2c56d---semuzoxufulemimeviwi.pdfIn PDF document text
    • http://jarosi.hu/files/file/67782779559.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/5a8d6d56155eb6cd8a31be20f55fa064/duwobukoriroxabatuma.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/966ff51b9c4dcdc7bcf2ce164ed83208/ponusafesitona.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a64a1cee329---15526433568.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8af430b744---sepif.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/xiwokamilifoxowuxaxur.pdfIn PDF document text
    • https://koratspring.com/upload/file/jumatabimobetamej.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/zotelezuwusavibumubago.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/dn6n3n1v77bemf135lanbg9htb/15294743483.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/wovera.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/30969576227.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/28efc4977c8ba013f6059303af8f7ca7/88184141919.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/c67e40fc2158faa5bdc725ef47e71e9b/foromevelarubamulos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=different+types+of+jellyPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000243c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x243C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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