Malicious PDF — malware analysis report

Static analysis result for SHA-256 1857a3c473103b0d…

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 20:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7df5169522aa056161c77100f2aa1379 SHA-1: b4fe9e5be10a6e883d44bedc93a11a124992b026 SHA-256: 1857a3c473103b0d133eb3ca2753c36f1fd1e3531dc1b3dc849c77059a875af9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URIs point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pharma-tools.eu/galeria/file/31193503773.pdf In PDF document text
    • http://ncabhsa.com/clients/875427/File/xupedaw.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/mufopekewenu.pdfIn PDF document text
    • http://wmhsclassof1977.com/clients/34196/File/papom.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/57217715809.pdfIn PDF document text
    • https://proxus.nl/file/dimixegixepux.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/92006381656.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/4030753427.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074f7a288a3a---tokavapokosu.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/zotoranurorigafumiga.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/6ljchq49v0lff910v59sqctk5p/50606307283.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/moxumenenon.pdfIn PDF document text
    • http://teplospectr.ru/images/files/fabaru.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/vudesaduwikejirileg.pdfIn PDF document text
    • http://abwessex.com/uploads/files/soxijegala.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994834b8a4e---95635325654.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/dudipi.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/eea12ed5d9ad22428416cecb447cbea4/mebirozedakopizadebulus.pdfIn PDF document text
    • http://intersonik.eu/upload/files/14197403340.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0a97b167e---44710235715.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/2da5469bfefe71dd874bff22dea24bf8/36047121955.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/51060009874.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/zapasuzezinujijejed.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/supodaburisasuf.pdfIn PDF document text
    • https://songhong.info/userfiles/file/wibubusivelewu.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/rugajemurobaxepobirik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=historia+y+antecedentes+de+la+contabilidad+pdfPDF 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_off0000dcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBD 18356 bytes
SHA-256: 77da650164d6ff1c4b8a5529e3b8879f5bdfa0d061ce6f89ed6bdd89b4ac3cb8
font_01_sfnt_off00010a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A94 10860 bytes
SHA-256: a49b30e7ccfd4fbc8169c351413d4d87a143c0994d9ece18d1dbdf1f67e74a70
font_02_sfnt_off00012392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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