Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea6413c0b9551fff…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 17:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 808e9bbd0c0828d8b55e0a22bb4a2b18 SHA-1: 2d3859791a00a6a10e3493cbb6f462f4212d78dd SHA-256: ea6413c0b9551fff8febeec8f94dfed57df763f4801ed6bd5dc53bdbf3a16f86
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites. The presence of embedded JavaScript, detected by PDF_JS, suggests an attempt to execute malicious code or redirect the user. The ML classifier also strongly indicated maliciousness, supporting the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=micro+sd+yg+bagus+untuk+android PDF link annotation
    • http://autoscuolepintozzi.it/userfiles/files/silow.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/53667435801.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/tatikixigusadajakev.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/gugopedi.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/37p3rrsgg5o15tqpp7sln4h558/ruzef.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/farogijutewafekoje.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/fugevaxoxamixejolilibeme.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/44227811040.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/84793671115.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc662649f4---18131215930.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/161428b2d43536---81416179464.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/95672831420.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/domigugaworefevoru.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/lumefobigaludeguzoburumep.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/bejuze.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/3523005175.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/22045118230.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/webonalarimupedukimixi.pdfIn PDF document text
    • http://metabolit.ru/files/file/92971126029.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/rijek.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387a3de2755---busovajijitoj.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/22081256601.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/vodaximekubixil.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/88417141828.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/23858589337.pdfIn PDF document text
    • http://jucal.es/images/file/15468287464.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_off0000dd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 16468 bytes
SHA-256: e1d908450ad472b7f1c88f91b655f1abd2cabcf5ebc977e83f4f00e830fc60b9
font_02_sfnt_off0001207b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207B 10804 bytes
SHA-256: 8c3c48509ecfe9fc7f135e738e4d2528455a86415d496ea4b157f7f6c3533884

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