Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c28725e5ab532b4…

MALICIOUS

PDF

74.7 KB Created: 2021-09-02 19:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4b7088b1aa98d9fe6e7b27cc5dbe2da3 SHA-1: f8af18df6938f6b20702aa43ff188c72db86a637 SHA-256: 0c28725e5ab532b406515e23fdbbc480276527b3ac1b625fd47ebab83112f22d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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://piqiso.ru/userfiles/file/xakesefug.pdf In PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/welimomevawiruzuzokof.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2df148995f---buvelizojelin.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/bmf1kene2c1electbh01t8vbt1/77583002927.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/jazajodavapefa.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/tifazudituxeruz.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/6434224574.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b212d68e21---lerojejozoxupex.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210816_155113.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/39300759442.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/4400998881.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/tomutotuxudov.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/89092226389.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/2qne585cbuj03en9a87c34r9ps/32255355730.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/584791e58394ca4db639cea0164ddee0/luzap.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824a1334320---sigajedetemanan.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160720352aceb4---tojeveveketegugiru.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/vasejizoxaroroperuz.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/jitotitakojiliwebo.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a713a038d98---dametaxezowitonido.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/98073102750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=business+etiquette+meaning+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_off0000c4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AB 10876 bytes
SHA-256: 134b87825c294a9459ebd68d7dafecc240ea1683451677f15b6a0d6eedc9717a
font_01_sfnt_off0000dd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD49 15680 bytes
SHA-256: 2f26da6a567380c588045228200a0131f2f753e206d2dd51386e0878f9c629bb
font_02_sfnt_off00010525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.