Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8be43ab8f38eefd…

MALICIOUS

PDF

85.0 KB Created: 2021-09-11 05:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 04c29ff30c827c32e51e0080add24474 SHA-1: fbc82be09e3239b94f6975705918d7a07253200e SHA-256: c8be43ab8f38eefd692feeb9e5667dfa603f79cff18cafebc066f5c02d5577be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link farm pointing to multiple websites, many of which are hosted on disposable domains or compromised CMS instances. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on potentially untrusted hosting suggests an attempt to obscure the ultimate destination or to leverage SEO poisoning tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130494c767a3---61458483613.pdf In PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/gunazitobiloros.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/padutezaxezubub.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/96554631425.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/wunoduvamodoguvogezij.pdfIn PDF document text
    • http://1careglobal.com/upload/files/funudukamelul.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/gitogotenixosox.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56516837647.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/21936937164.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/punoxelidixaladegipevume.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/55005633887.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/derojilaninutewa.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/50672291580.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613021f02759c---matibopedujubopojemota.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/11058235356.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/kaxovexakapu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/kupilisavus.pdfIn PDF document text
    • http://trieuduong.com/images/Download/79098695766.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/29717274089.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/kidojiwixexonemedu.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161356f6b3c5ff---guluxajo.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/87f83d67d047e677a5d578c6e0719cd8/zedivaxaxofaxek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=slot+machine+androidPDF 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_off0000e87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87B 18080 bytes
SHA-256: 2eb079f9d901b5dd90c3980f201dd3c7c8fd5a036ce8207c26b633d1183a72ad
font_01_sfnt_off000116d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D8 10540 bytes
SHA-256: dfa05e7c38bc27db33b228406c5b5fba4dfa24f2bef096e30c0e2700790b351e
font_02_sfnt_off00012ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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