Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcce6de03ca0779b…

MALICIOUS

PDF

85.2 KB Created: 2021-09-14 09:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 694126468ca3d08eaf84292e448bb364 SHA-1: ee3428923b13dc4c9e7fef088937448d757f2047 SHA-256: dcce6de03ca0779bec51cfa7f330196a48b968bf4589067549c34355330ff928
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, forming a link farm. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

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://k85shj16h-561lt.com/contents/files/mapudimog.pdf In PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16140170393407---77316932778.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134dd9174150---95095794734.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/17053025739.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/31887472128.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/jabupuvufe.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/pigumofurevevaranon.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/zemuxijijakomupusebil.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/34935912491.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/51098976416.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/lulanupozuna.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/93501728799.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/sopimo.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/30d91e64f41099491ea710881cfc5b9c/zowesodujikajul.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/femen.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/72152979621.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/tasepozonabulijaxusisi.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/bepevarexugezufen.pdfIn PDF document text
    • http://protok.pro/upload/files/dagogininitoruwolumixil.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/xuwufirekepuberovul.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/tutezemafaranizewebedezi.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/18551257101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=dream+league+2021+game+downloadPDF 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_off0000e628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3A 18792 bytes
SHA-256: dec03772f1701ac8465003a03b283e516017aced00367dd5a2ffaa200255b525
font_02_sfnt_off00012eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEA 10712 bytes
SHA-256: 4a571efb7abcc31b42e8441b5c0ab7830b9795dea4742e4b2a9b0c62040e3556