Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f5b47e85c9ca36…

MALICIOUS

PDF

73.2 KB Created: 2021-09-03 10:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f3cac74e7ae4f1526435a35a66f879c8 SHA-1: 1b4fc77cd0d55f55265f0733fa58acf4c0b60187 SHA-256: d6f5b47e85c9ca363a0eb167b8a08328ff29332fa14b0596947dc8731c2213fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content or phish for credentials. While no scripts were directly extracted, the nature of the links and the detection indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/4hs2udk2q8ijqg03nfmrr0mc73/38663414612.pdf In PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/o4leoe6klhsr3oarjuv6riodh7/rijilo.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/pujavomatipaboporonoro.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/79511128055.pdfIn PDF document text
    • https://starbox.fr/img/files/59868971283.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/88426701804.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7fac31f32---79208178158.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/20220642122.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f23547f5a0e2ed20a34baa8605530fcb/pafifixugofujafugixax.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0db25645d---potoxomodezowikipeba.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/3d8698e7f16a9d2d491f79a0b4d4bcac/69132613217.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/87b62a7410580e7cb25d503c3e9210dd/wakufo.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/relebetovula.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/2450397f5dca7f73a262f0ea752321ab/2845071895.pdfIn PDF document text
    • http://kotolantopeni.cz/file/62564644143.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e2cfc5a14d4---19703027248.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3958eb373---wimenazuwivabusu.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/pf7uv2qdg895s82ivbfeblmofo/virepogujapizenatixo.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/pubekc61ji3k3g7uva8lmvfbt3/mafiviwujowa.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/safibawezat.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52f559764d---10195468842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=jandy+pool+pumps+manualPDF 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_off0000bbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB8 10336 bytes
SHA-256: 4df551b57bc20e223dd0654882843209d65e0ea29485480cbe02c4609c48c022
font_01_sfnt_off0000d300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD300 17124 bytes
SHA-256: 6b70870d0a157c31e99c2be0b60d89a1e15a96308424227196310f3799c32d02
font_02_sfnt_off0000ff58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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