Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ac50ea9c92ccbf…

MALICIOUS

PDF

75.3 KB Created: 2021-09-09 19:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4ddebac8579735bbf964740159132aa7 SHA-1: 95cf7892a417c8d8bc2b281b988a217f030abc57 SHA-256: c3ac50ea9c92ccbf21b8b37437358414d3d1f579337cfee2a784f8bd7405b3ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be disposable or compromised hosting. Heuristics indicate this is a link farm designed to redirect users, and ClamAV detection confirms it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 https://krisoc.ru/uplcv?utm_term=mod+version+of+road+warrior PDF link annotation
    • http://swvocal.com/data/se2/file/tapiforobipemexatirazat.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/nexupojiretubepe.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/fupedorafenotelumavu.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613331b90a762---18091277194.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/piseniwebor.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/tasunerenepevanenajatejo.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/novefikojudajawuw.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/mekaredafitukejilimati.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137e05de5d30---52501475821.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/womonedenirew.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/57231188254.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/gonubusu.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/gomopekivuperozuzonevu.pdfIn PDF document text
    • https://phuquiland.com/upload/files/pikewakanakijokokegaju.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/65302875949.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a1cbb7901---pabeniroxe.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/20910741811.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/69071035218.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/14724544535.pdfIn PDF document text
    • http://parentini.it/userfiles/files/fegixefevowowefa.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/seguxibag.pdfIn PDF document text
    • http://horvathortho.hu/tmp/28163512578.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/kapagima.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/52977534555.pdfIn PDF document text
    • http://teakdeck.pl/files/file/padunonejotiluren.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/waxijetapebexagakusefu.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/zaxumosaxiw.pdfIn PDF document text
    • 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_off0000c3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DA 10348 bytes
SHA-256: 1efe67a050e311fdfc0d9fdbf4879296a585e0a0e3d4e6f1ca7bff41437e4df7
font_01_sfnt_off0000db5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5C 16944 bytes
SHA-256: 99d0b59a13eadc1201a7f1bcb0f4cb1e10ae671f4d6525cf5131b9564eca2e0f
font_02_sfnt_off00010760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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