Malicious PDF — malware analysis report

Static analysis result for SHA-256 86dba67757cba438…

MALICIOUS

PDF

75.5 KB Created: 2021-09-08 04:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a8372a5dc0f21559039d35f791d99b28 SHA-1: 97c7aa1dddd930ded48857bf78c77e82305082ee SHA-256: 86dba67757cba438249978be67a18a1b56a5fd705d0d9490b7902954a6ffcae2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. These links are structured as a link farm, likely intended to redirect users to download malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://laborke.ru/uplcv?utm_term=bhagavad+gita+as+it+is+pdf+free+download+in+gujarati PDF link annotation
    • http://monkey-do.net/userfiles/file/79844960819.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/27963505643.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/63008355644.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4871baf82---nepexifabobibidilimaf.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56a4132743---41105066586.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/mamogagogoxasigereporunu.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/36400681475.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/zudukilexaxusirivomisasij.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/25152363678.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210903155437386019g3cw7g6mudjz.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/44210362603.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/kagikoletoxivewonoru.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/1c1c038bc095e56c620c512328d3efb2/82788124418.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/83044699019.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/3105879856.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/fimuna.pdfIn PDF document text
    • http://erdbau-rauch.at/61192877073.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2a331ae60---93627922807.pdfIn PDF document text
    • http://www.emailposte.com/pictures/luxodavatuvuwibosebew.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2cdbf16a9---rujojodamijavirukokipakez.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/kaxeduxelezowikibovaxadi.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/30232759274.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f87cc7c9d1d---15969925797.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/97066532444.pdfIn PDF document text
    • http://w-mill.jp/images/file/vowoxasegexizer.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC205 11212 bytes
SHA-256: a6ac2f90e1d6b7cd3ef08cdeeda98a614bd7327bb381e0c9296519d523a79810
font_01_sfnt_off0000dc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF427 16972 bytes
SHA-256: 77c8008223f169fa338f93fe078f99841ce1038d4e8ed17abb2e7abe2af9bfea