Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b6d140f313bce3…

MALICIOUS

PDF

79.0 KB Created: 2021-07-05 19:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e247656712f884d683aa6d6bab247c91 SHA-1: ecc4c8fadb012f493282c9a8396e3e3c84651395 SHA-256: b1b6d140f313bce311596cfb4a73defdd18dd9380a774201a0d2b52379f5a3a6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics indicate a likely attempt to redirect users to malicious content, potentially leveraging JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5306

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 https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/5dcc441slj0nl1kg5j02362h3b/jemerorepewenubuxow.pdf In PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/nubotejemivakube.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/646ejogjq7lf5v6iu2m2n2gvlq/84201497430.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/78351312943.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/ranugejikudibupon.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/ad2bbe484384334228cd07e016db06a2/36797427529.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/84672827113.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/4f4aea3cc996def9791dd50264c23303/buwokevoxuvepuxepi.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/92508709526.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/tajosinovigimal.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/ifhrnkt38bm0rbov6m49ecarna/46265971957.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/zedonedebedilajo.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/69931bc1c212f0af6802b5776c04c368/37154783273.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/c5c2935cc456699e8199ae5be2189b57/subapobofinuxeroniketox.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0c4cb6e52---rerasumabasujavet.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/44558054146.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/27220056631.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/21ab591f261d538ff879ba976e9e9aa1/91498443168.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/4mt9ktdpsen19bec52thf25luj/nabesipujidimegemolaxot.pdfIn PDF document text
    • https://maisonforville.be/documents/file/gatuvul.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/4aeb6bd615017ebdd7fbe80ebe352466/1774008121.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/97470042771.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/kidavajivorerakifekuka.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/1bf3e93ccde7cf94a96c70d886312835/xejaxemofaniko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pics+viewer+for+pcPDF 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_off0000f623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF623 19116 bytes
SHA-256: a6b77c9a9dd39e99c879d8698c33b91fd3bc77ebbcff32c823a9b0afb11abe46
font_01_sfnt_off00012668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12668 16304 bytes
SHA-256: 75d9bcb141f15990f163efa43d9bd2774c9610344cae59bd23a7d17622d8a73a