Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec62e284bcb7318…

MALICIOUS

PDF

89.3 KB Created: 2021-09-14 06:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8c9d9990c08e971a96d02d1d3da32107 SHA-1: 8c4877aba209440cda47f8d95d3c4acb643fe5c9 SHA-256: 8ec62e284bcb73182464690d2bcbfdcabb8160bc15e8069eb74b8af124d2420e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains embedded JavaScript and numerous external URIs, many pointing to compromised websites or link farms, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript indicates a potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • 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 https://www.stock2morrow.com/ckfinder/userfiles/files/vobunofuva.pdf In PDF document text
    • https://htapigroup3.com/contents/files/dorotupiwajegepeso.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/65008615614.pdfIn PDF document text
    • https://nexusmediation.nl/files/3783593184.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/17004429670.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/bidinasejakilivoni.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/sovewovatunefol.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/60218357443.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/votuxagufiru.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/7cb0fe0f5ae4069d623fb0e3919aa7b8/66041760386.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/a8cda80ad74c54ae13f327f0a0e84c9f/65493258394.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/91066053763.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/10679298606.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161316213ec82a---60071095707.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/tegozirovo.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/21649642510.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/91910204957.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/39064457456.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/jiratepas.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/uht9ok2at6vdsqcsnva93cm9e6/55051490935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=rxjava+with+retrofitPDF 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_off0000f43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 10420 bytes
SHA-256: 80324bfc7474f21fdd7326320fe76c1dc636562d22e1a05e6e5fa3c35b2f5132
font_01_sfnt_off00010c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001241c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241C 19576 bytes
SHA-256: c06eb3cbbc967669e25782ce152e2fc4c7a148f2a83f87575265b6bea0701139