Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81586941b1adcbe…

MALICIOUS

PDF

60.7 KB Created: 2021-07-19 23:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 990b25ee476dbb3b8b1da29676366269 SHA-1: 0907fd9f14f9b19e40c0cedfb0e446a507a87a2b SHA-256: a81586941b1adcbe5d05c04182ff50c6e1392849da0d4d187c7d220bf7e5ed82
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that utilizes a link farm strategy, embedding numerous URLs that point to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms suggests an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5356

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://mousike.it/img_ins/files/kuzisufoduregupimugad.pdf In PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/lexif.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/910c340182c9e6341439257aa174622a/12439870230.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/f01d4eeb87eab732f1a3de97e844d987/40549502962.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/91123606480.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edc7baad49f---86548404362.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/66decvk7cetfldfot8ag37lj4h/97680924773.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1a5c9d133---gijogowu.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/90680790013.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/gezikovumowiwavazo.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/nefewofifevezukagut.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607701162fa4a---36335889620.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/20779398976.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/5335218018.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/13a85e3b52e1a373a6dbb43b6b2dec57/nuwuze.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c16b23f6c---56856685542.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/lanomopinilugevu.pdfIn PDF document text
    • https://hojoairport.com/images/file/79777685512.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202106290146393913.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/1td39nh1jc76ot5r40gk1t02nn/87505043809.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6304e29bac---16416754148.pdfIn PDF document text
    • https://fasaac.org/temp//files/vepawodejazuzawi.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/mpc5caop3fs2rcq0v9229r503d/13044152959.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/803860210bc0c3b2681a0809e3f84933/mivupi.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d7bd2c718---77861680175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ucits+and+aifPDF link annotation

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