Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1c8d6b89263e08…

MALICIOUS

PDF

89.6 KB Created: 2021-09-15 09:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4f780f5a6d05ed843c1887b33fd7c9c1 SHA-1: 6378d345e155ffbd857b5d0035b7baa578158af9 SHA-256: 6e1c8d6b89263e084cfd6aeb5e2261310fa0de334bbb532738c0153c9fb8939a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to lead users to malicious content. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate an attempt to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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 http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16131752cd57b9---texok.pdf In PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/2261349089.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/42341922243.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613354f904236---kivamabapitewope.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/dipaxisutum.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/baremewukevokufuwivitu.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/26952919279.pdfIn PDF document text
    • http://nut-shell.net/upload/files/tawipowubiputubozoretop.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/mavegozugaziduzid.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/52999424722.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/83636062619.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/tukejubebetejotenatuf.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/92398213806.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/rufugepuf.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/luwonixikome.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613979e67b46d---mefano.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161373275ca0d9---52137255392.pdfIn PDF document text
    • http://lagrupacio.cat/file/kidozifomoloxefikurudu.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109050255057811.pdfIn PDF document text
    • http://elskenecologie.nl/files/moguzujavanive.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/67893592488.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa09e9b011---totedozide.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/witimovo.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/60649745169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=war+full+movie+online+watch+nowPDF link annotation
    • 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_off0000fb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11320 17520 bytes
SHA-256: 41505ccf713f5c276a144ee1a98c8d801942b985a987352337fa13a769a9e6ca
font_02_sfnt_off00014028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14028 10680 bytes
SHA-256: 4004634183cd98b0920056365c1f63c83c7131f0ffbe72cca60c65c155802116

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