Malicious PDF — malware analysis report

Static analysis result for SHA-256 4476da9bc804e83c…

MALICIOUS

PDF

74.9 KB Created: 2021-09-16 23:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d9aee603b62048d1dd1c66f0f794c6a7 SHA-1: f53c07d223cb81c229a6ac15bf5f0f3cf15bb2cb SHA-256: 4476da9bc804e83cd49090ae26832bb7287075b9ee803ab61dab7497a97dac1c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are flagged as potentially compromised or disposable. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for SEO poisoning or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://damsindia.org/admin/uploads/file/sinekikidira.pdf In PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/damusalibexazidolo.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/12104250579.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/64355922302.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/52906f450e9beb2114dbd81361d4beae/gewakabivowik.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///boxokomujumepebe.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/35969519711.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142a8f433a04---2978475348.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/rarulinejabalokavozufez.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/jadesajunebagif.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/xomupubiritamosexudetag.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/xigeg.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/luvimubinemixo.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/wiweraxojikalomevigef.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/levafegumawugipiwesi.pdfIn PDF document text
    • https://fultoys.com/userfiles/wumolasimuzizebilosatopi.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/70134718501.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/31601722535.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/42858691971.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c624a3f1f3---pedujurisisatasawepiwuka.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/98843445076.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140426fc2b88---zakodubaxenexunuxodusajer.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/sanedupolobebosimawapus.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/nubejedokalawozuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=badrinath+ki+dulhania+torrentPDF 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_off0000c030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 17908 bytes
SHA-256: abfbfe8045a64d6bf0364b30cb252bd5607f99ed6c8d5026df7b722ad20e5792
font_02_sfnt_off00010634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10634 10420 bytes
SHA-256: 2a740947c2ca7bda247b91c5a393863d8d00fb04345215a21ff1a8b6a7122c47