Malicious PDF — malware analysis report

Static analysis result for SHA-256 7076cf584f501e19…

MALICIOUS

PDF

82.8 KB Created: 2021-07-10 09:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5f2a2673994cc4e29f5c62ecd15e9dac SHA-1: c9cbd98d74face0fac91a1b5f1b5f1cd62aaea7d SHA-256: 7076cf584f501e1931f9a62e50f07f38340eae37b972bd3f15ad0472edd8ee82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The PDF structure and the presence of multiple links on disposable hosting further support its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e65258ce9b2---xametagivibuwajipiraxemi.pdf In PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb9b20f47f---ruworudutukudufiposudit.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160777f9bafe35---2376254723.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/54562840436.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/56922069648.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/nixerek.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dc18c9582---pobifilabegifujitamazusil.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/81621102067.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607875fa937ee---36411423639.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/gipogiwalidubajub.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/54826985213.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/31912546601.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/ec1c6a64db25909f875901eda31e1467/lokopagifavit.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/75880265828.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/69189183012.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/wagaxodi.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/davokijumopibopemuleba.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/xurelodiroxadasisawigosan.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/l1r4fl41gd2dbksr7029vjc9k9/motudokaredozabu.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/7303773477.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/40133933279.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/12227250348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=38+ways+to+make+a+perfect+coffee+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_off0000e15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15F 16304 bytes
SHA-256: 9dbff6ad9ba400279ab3b75ab52a1caaa55f7f04428f0a97ce7bdfcdc039c0f3
font_01_sfnt_off00010ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BF 11116 bytes
SHA-256: 04cd271940ee9fbe1a79eb8249367275b95ed7cbbf6978d92a11237ee881763b

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