Malicious PDF — malware analysis report

Static analysis result for SHA-256 53bd7628b6c33f1b…

MALICIOUS

PDF

67.0 KB Created: 2021-07-23 23:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fc530c5561384a9f717790211ca59f8 SHA-1: 80a7456f1e6f0c7100d13f95626a1c19d32935e5 SHA-256: 53bd7628b6c33f1b366e0857f60a137a94698cc7446db21951286f4ad9e63fd0
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to potentially compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of these links and the overall structure strongly suggest an attempt to trick users into visiting harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6892

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://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9aad21e7c---97190782893.pdf
    • http://aucoindeshalles.fr/menu/file/89770343747.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/6cf02cb8b87f74b67be79973836a6702/tifulezesovuwevados.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/5a99d5529be059c63b25476f0027d08a/57898799464.pdf
    • http://short-story.ru/upload/file/81009219246.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f4cef33f18d9935c861c2edbb7e86613/jutabafu.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1887eb0d6---5144029209.pdf
    • http://www.abcklima.hu//data/editorfile/fasafirusevewavago.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/39d7f0bf99e04f11397374b32699bf3f/lufovilofivibuwexu.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/5d8faa11d14d8a4c627076380448e803/gujogexoxujuzimerunoreb.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/3359scitpip5qebdtm4a5sa2mh/tozilulisop.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c089969f5b1---xerosebuwolen.pdf
    • https://spacio.hk/attachment/file/gugigevokud.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c9305d1af---fakevifukufuzojiworepom.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/iebpmnmoc2p4amnphf65de74h0/98593118018.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c2ce64e6f---semutul.pdf
    • http://keigan-productions.com/clients/863431/File/zumab.pdf
    • http://beamstraffic.ae/amb/userfiles/file/66640520526.pdf
    • https://numen-wow.com/userfiles/cloud//files/zidot.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/618e018dd66f0870b2b851e0d065f49d/rusimifagipi.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/4cb8642872f18b0417a82348ea02fb7a/61594355348.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/07afeaec5c05445835d1457e0270ca92/80477848238.pdf
    • http://thunderstar.cn/userfiles/file/20210612001428409281198.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16092310e5f26a---datizufaperibomafezipexa.pdf
    • http://usa-ex.com/images/blog//file/tebipanedowomomug.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081b20d660b9---xabijub.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=evaluation+mouvement+et+vitesse+6eme+pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de92.bin
13ccff5b0cbe3e327cfa7a81986eb63ac4248f80f03c0ff13a4eab8970d1c48c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE92 10876 bytes
font_01_sfnt_off0000f7b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B2 16792 bytes