Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e87c606e1889a1…

MALICIOUS

PDF

76.0 KB Created: 2021-09-24 08:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a455f56762bc88c22abe21d8f6421ce4 SHA-1: fe331cd3fa8f9d9cfc39f98262c6820f16eb4587 SHA-256: f0e87c606e1889a17ef4ffa15eeba5817dc05b03d7bada35b1472987c0d3ebfc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, including one pointing to a compromised WordPress upload directory. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and link farm heuristics suggest an attempt to redirect the user to malicious content or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://thevalleytrader.com/files/29481715853.pdf In PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/6969932c1e8f9a1991d0db01c2da6544/16859986807.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/dexutukiwegu.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/rixubovew.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/13642332893.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfd7f64176---99411281100.pdfIn PDF document text
    • http://355353.ru/userfiles/file/69161598350.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/47173056563.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/pivobetopebimukad.pdfIn PDF document text
    • http://imoroz.by/upload/file/pibatisige.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/49535430894.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/384587846.pdfIn PDF document text
    • http://space-edge.com/upload/files/fibamalidira.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/rujevuwil.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/tizuj.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/5562730077.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de913270ec.pdfIn PDF document text
    • http://holzweiss.at/lozixomawopimexiwulamoda.pdfIn PDF document text
    • http://laguna.piyawatgroup.com/images/files/masozapalitekakuzale.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/85462611282.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/71504864054.pdfIn PDF document text
    • http://spakimthi.com/upload/files/bamebogawadejobive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=nfc+enabled+meaningPDF 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_off0000c79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79E 16976 bytes
SHA-256: d7285dcd8d3a2983baebbd82f5d11cfb498868526f58c3977309f5a1a942320e
font_01_sfnt_off0000f355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6C 10452 bytes
SHA-256: 9e6c2b91394ad59e2cdd521a168a95a457f92fb8506043c283d16f01c90dfa0c

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