Malicious PDF — malware analysis report

Static analysis result for SHA-256 848bd620b9d84300…

MALICIOUS

PDF

89.9 KB Created: 2021-07-06 08:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ddd5d8ff067b1346f35adc3efc721789 SHA-1: f3ad8f246009b76d7affe181d48c8b2166df0301 SHA-256: 848bd620b9d8430026a3f859dc35612ef90e9fdf235aeff509834793bde05376
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms hosted on disposable or compromised domains, suggesting a phishing or malware distribution scheme. The presence of these links points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://garglob.ru/uplcv?utm_term=disadvantages+of+mobile+computing PDF link annotation
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/437a8a3a179bc58d3cbebef449d988b3/kadumovexative.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7418fbe2e5---71737135062.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/tapipig.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/42650480156.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/tifonesimokimukuxobakajul.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd6a805c16---78170068231.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/58007324164.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160833c35a2e4f---17602067676.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/97925090ee4614430eb470d8407ff403/wizorijudulekulutepikepef.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/d409bbc71f83eb5a604f90563e5400de/62406779593.pdfIn PDF document text
    • http://essuances.com/ckfinder/userfiles/files/gaxowegosezuxifalit.pdfIn PDF document text
    • http://mlight.cz/archiv/file/wenotowipazijaku.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dd5ee103e250cf4a018abf9f62b265a7/jelusunipumaruve.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/23953283045.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/87202c27608c4278b2c88f02eb6638f8/donuwegadinezazi.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a705569b5b7---fazelijag.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d89682ca1d---94669512413.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/30224639977.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dc2e12703---92923890623.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/duzuripigo.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/rinejoxuluxa.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836e60b8011---74667450980.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609109f53c474---zonalikateku.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_off0000fd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 11172 bytes
SHA-256: 37154e413630b25f449f8a6cb73efe628a66b802f0299f9580ca362bf234a272
font_01_sfnt_off00011745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11745 16592 bytes
SHA-256: 565ec624412913f5caa68bdb60a9ed0db5f175e8e050ed8a5ddcebf40778f332
font_02_sfnt_off0001422f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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