Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c2ae5bb43527ea…

MALICIOUS

PDF

302.1 KB Created: 2021-06-13 07:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9be1753f287b73045265109f92a93053 SHA-1: 65b9a3528e2033a37beee41d9e43c9cdaa3849d8 SHA-256: a3c2ae5bb43527eaf9ed9fead82b9dfbaef80e53d9e7e7820190f9e56a306306
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites, likely intended to host or redirect to malicious payloads. The document body, though corrupted, suggests a lure related to 'hsk 6 vocabulary list and sentences pdf', indicating a social engineering attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=hsk+6+vocabulary+list+and+sentences+pdf PDF link annotation
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e474c03bf---misudakusujuluxa.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/xarerunedi.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/m6lknfauukj4co1mqc10eullpt/mewupisewoleloxasazuz.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/ocpun05sbf8e985m4he1dnug50/sopedatolupevorojimuwunax.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fcd92346a36bab5dc42247c53b815ec0/xelamivegubemadixux.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/5kupljrhbj17pmsme9hlmk1lqq/28600829922.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/gokatexowuzeliweketuj.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/136233bdb6874ac81536b75053f5d0ee/66709563066.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffc5cbc9c0---87776350402.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609afef8cb9f1---suxoxolegevotonuretamov.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16099cf0b2c718---tigogajorebipubuxexibewif.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/kirakebuwo.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609004c6762fc---82721528092.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/e0f7b94bde7658309a9d65bdc6a9ff6f/jafoloruzupeluxamolu.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/23828326159.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0001929d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1929D 246044 bytes
SHA-256: 538ca7268999d1d4b08f8004f180fb2fd5f3dba33cc29549d442a55e0d1cb5fb
font_01_sfnt_off00046060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46060 5512 bytes
SHA-256: 1516ae5b076293663acf0cd8af6aa275ccd9a52cd8aab4854e9e930893856fb3
font_02_sfnt_off00047322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47322 14304 bytes
SHA-256: 9a45ff5e29753bce208161f8cd10edac48cfa809c7ff5cbe0edcfa5a477c48d0
font_03_sfnt_off00049d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49D05 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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