Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db66d865b89a1d7…

MALICIOUS

PDF

94.2 KB Created: 2021-07-18 10:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 347f6be18fce8579aa9d3e91d4dabf6b SHA-1: dd20c421a9125887e512153e7d006752720f8e0f SHA-256: 6db66d865b89a1d72e920eb1287627a9e35cc20a6104d0a4cb2c18d5fcb0bea4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns suggest it's designed to lure users into clicking through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 6

  • 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
  • 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://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/942df48a1ebf45fc87c542e4a7a931e3/xisizezata.pdf In PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a075793b8e9---bujit.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/69215802078.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/96623004854.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af6fc3a2e98---bizogexevozivawa.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/m7mmb3hmtkh5di87p3gn91vbuu/95924782449.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/toxulelasejej.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/22850672880.pdfIn PDF document text
    • http://nhs-carpediem.com/clients/46367/File/xuzofobatajowafafegem.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd4bbb2280---29829477583.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/49f93f38207de905f512be3e9c2ea018/30637511120.pdfIn PDF document text
    • https://aashianarealty.com/file/kovuzada.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/65246983402.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/ledakisirigudal.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/wujuz.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/34247247308.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/54955112253.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gmot01vr05ggelnchmsj9po790/4015126442.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f23a232b44---36665573615.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/433bcfff7759922f0d8e761b63833877/8868766909.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16082b731be6ed---20596192565.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/4574207921.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/tewawunobaleta.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/80431201166.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14a2b5aa98---gitexazafurujufamaf.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071cb657bafa---82147439639.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c3d006142---61349898838.pdfIn PDF document text
    • http://digifast.cz/userfiles/muxenobavud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pink+roots+silver+hairPDF 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_off00010ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF7 10364 bytes
SHA-256: d35c3df16524975e3bff0387d63987b5138002692a4c11ad05961378463dcee4
font_01_sfnt_off00012654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12654 17292 bytes
SHA-256: fcccc90a2779eca55864f86a949152966bbcbdfc25a853952bc911d3f31cc371
font_02_sfnt_off0001530a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1530A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1