Malicious PDF — malware analysis report

Static analysis result for SHA-256 a793acc63a6ae4d5…

MALICIOUS

PDF

78.0 KB Created: 2021-07-02 19:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88fbbf2a0c5f3064b130011d9d9d7788 SHA-1: 4461668252b670255e4ce6226911f82d3032df16 SHA-256: a793acc63a6ae4d544eb7447cf2c8f787d51dcef0f3343a237f6a143d0950c39
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm directing users to multiple external URLs, many of which are hosted on compromised CMS platforms. The ML classifier strongly indicated maliciousness, and the presence of numerous links to potentially malicious or compromised sites suggests an attempt to lure users to malicious content or phishing pages. No scripts were extracted, but the structure and URL analysis point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 5

  • 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://ebal.ro/app/webroot/files/userfiles/files/48126673922.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/0dcb59c2c69cbee96b6a1ea9868747a7/92862976673.pdf
    • http://motivationandmomentum.net/ci/userfiles/files/zijoxalivuzosavososodib.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea0f9633d---xemerazuzojovovabazaloge.pdf
    • http://guojingmall.com/userfiles/file///6363376452.pdf
    • http://color-gateway.com/userfiles/file/25798559516.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/1b750225b4d97158659dc7b13bf20df9/82851793875.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16098fa182a78a---58022312122.pdf
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/98865753935.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607119e1d8d3f---gujorovolevariduguwiv.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ffa159d5c---52357006962.pdf
    • https://crownprolaw.cn/userfiles/Proj_Name//files/95384057615.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3169319c12---palozuleruko.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/e544e2a8de525df56318629a047cfac1/fujalanovuwizumi.pdf
    • http://lavalnerina.it/userfiles/file/xizivupuxabuga.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/e94517f0a53a7c0a9eab6b49f1dec109/xipojinakovifadiloka.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d92dd7270e---legozivizilox.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/pasovitozurokolepegegago.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16099caa0f0175---zapifimudagel.pdf
    • https://elnativocoffee.com/silver/upload/files/dubosetonodut.pdf
    • http://vervesimuhub.com/userfiles/file/30491024825.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804516f026d---43430677658.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/ccc5a99a528d92e1408c1b1b0311a5ba/18790993058.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=38+special+brass+for+sale
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc0d.bin
534b6c26d3c8823c9ac1e6e2ea9f55d397660d7b6e1857ebba8d0a3066c7b121
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0D 10692 bytes
font_01_sfnt_off0000e46c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE46C 16792 bytes
font_02_sfnt_off0000fc7e.bin
59b679a0035bf5143880cab45da40f06027c7dbe0bbfe867e50d11c1446caca1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7E 17608 bytes