Malicious PDF — malware analysis report

Static analysis result for SHA-256 828ab1a7bf7a42c7…

MALICIOUS

PDF

125.1 KB Created: 2021-09-04 01:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9a2ed4ba4ec3ac57ab7113e97c8fe3fd SHA-1: e2f883fc192d5c83107390296062e87b834c4b03 SHA-256: 828ab1a7bf7a42c770578105558c81b99d3afaa0953223bde7c99222bed1d85e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to external websites, many of which appear to be compromised WordPress installations. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://crewmak.ru/uplcv?utm_term=siemens+logo+230rc+instruction+manual PDF link annotation
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/baf7180fdc2d25a98926438395880d65/weged.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/66232983285.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/fa769a4a78203c7c540ac7d8579e0891/vepevufipotijebok.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/kujufetawamokovaz.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/38213694387.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/kotagotevijatape.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c761884ee5---xiviladaz.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/mivonod.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a080622742f---gimanasiguweluvupanadop.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c133a0c6b83---6338868615.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863f124edd3---11595796873.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/finepewebemeve.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608549dfa6743---puzibusefomipegagifat.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/23200845947.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/tigosopegixufifaluzusase.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160faffe0e032f---funetamebagapifonikodizud.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/52931336905.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-8-25/20210825003309394520.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/50991307412.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/2ad9ebe6673439ae86b818dc19555a3b/3379525025.pdfIn PDF document text
    • http://air-con.ru/upload/files/zapirikizisozoluv.pdfIn PDF document text
    • http://polletnv.be/uploads/files/zodoje.pdfIn PDF document text
    • http://debten.net/UserFiles/File/79239119074.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_off00017d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D8F 19988 bytes
SHA-256: 2cbb7b72516ed07573983372df95519141da54053f6a0103cda290d3492b2e0a
font_01_sfnt_off0001b216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B216 11160 bytes
SHA-256: e3168ed09a4e2a1406b12ec76efd2c0d0c92c8f5ba8ff8a9c7c90f70025de202
font_02_sfnt_off0001cc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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