Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb580a0a2f8cc43b…

MALICIOUS

PDF

63.5 KB Created: 2021-07-01 18:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8e5838d3ef006accd9a0dd1252848524 SHA-1: fa887b2f23b4ffeba1cb91f8ea310fc4d656a923 SHA-256: cb580a0a2f8cc43b2c8a07b2db0d4a333e47ab5f6de707cb94909157e9563411
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to phishing sites or further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5714

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://smidgel.ru/uplcv?utm_term=how+do+name+tags+work+in+minecraft PDF link annotation
    • http://bsbcarpet.com/userfiles/file/sireboreminanimorute.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/97485021197.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/fotebafolopizeji.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1ddfbe782---25433821539.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/2f25057b5eac6e4ae75cadcd413e0ca4/91029715958.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/3qpd1sb0dcias1e812qg905rm3/tetepofimexirepasefumuful.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bfa4de2d9---tisufugebe.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b2552caad---47408170993.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-4/20210504073734236208.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/lelefuxuvaxoluni.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e910b4c1d1---fosubiladuzumovexaxoxar.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/27ctvju1u7kv1l3mr73c77io39/27033103267.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/m48reo08clau7hacok54vo7qf3/nulavofutafaz.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/nebivejojisitemizopuwu.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/pudimuxawis.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/115f70815d0da79dcb4faa5d3d1641c6/xuwuxepewuvukazomipi.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/0accd72d29431c963f6c02b1845cba53/31804050328.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/59991977985.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/3df887589c45d5fa75d7aff4f247e19f/bixugugemo.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c662ec86ae---xuwinatuforewemomujatugo.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/1509b8272614c26db11bd8b9562be7cb/xudipapujodedabokizewow.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/vufarusum.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/f79f700717fc5738dba8952be47dfce4/99718049227.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609b75f83f5f8---21748915000.pdfIn PDF document text
    • http://18554080.com/userfiles/file/liwumizedelewunibu.pdfIn PDF document text

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