Malicious PDF — malware analysis report

Static analysis result for SHA-256 3790cca3ae964217…

MALICIOUS

PDF

85.9 KB Created: 2021-07-13 15:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11e7ea54a11157eddcada4b6001d84ae SHA-1: f673ad1ae6b2fc2ab8a05ee2c237c6f05611b999 SHA-256: 3790cca3ae96421744fe7d20e2185c2acc8c86cede608b91ad9bc1e679b03004
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. ClamAV detection and ML classification strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://curry-box-deluxe.de/userfiles/file/29420977730.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb9e55e512---vanuzuredi.pdf
    • https://ratsimae.eemedia/contents/file/jumozomojuxemapewosubita.pdf
    • http://greece-ex.com/images/blog//file/99517356945.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608888b8ce0c6---40101483348.pdf
    • http://gasnguyenanhst.com/js/ckfinder/userfiles/files/gerujumagebob.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d0d121ae9---59063533020.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607802950f245---76915340655.pdf
    • https://agronlogistics.com/userfiles/files/jokesap.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/fbn82einac3l7tn5ghsgjh9ufd/9542402149.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/1j3up3irc3oecf2hhclutkrkco/pefute.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9590ab64d6---13259052409.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/ukdd9tngi7jc35a68od79bah00/davemakipuxorafop.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/2aea2a92c9638dbcd3ab2632b05b1eb6/xufarabugodamum.pdf
    • https://securitydm.rs/slicice/file/79277679594.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/79da72654e08b629ecaf257bf966a42f/77532348456.pdf
    • http://sllight.ru/design/img/upload/file/85972178844.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62d453e180---zowuderufolavisuduxogexel.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/q4e7se5dqeft070ug1cqqlr7vi/ledofegulexevanuduzebami.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/gk7f646ba5g0c2nrtuguos71b4/98884599498.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/fb8d69434783a4a6f1bf9d58dcc7f992/41203878293.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608463655e465---93793649516.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/aec6b37325e84ed3bea7a39107ae0a3d/8195687147.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=chemistry+unit+2+test+review+answers
    • 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_off0000eac5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC5 16792 bytes
font_01_sfnt_off000102d7.bin
0f12a8b8bec6a2f700b65b9176dcbbc7d214c95cfa91515bd293a9a2fb3b7981
pdf-font-stream PDF embedded font (sfnt) at offset 0x102D7 17932 bytes
font_02_sfnt_off000131a1.bin
808f5fc2e3c358be911a32fc9fd3dc09a10d7b3fe1a51d98ce80fe3e9aa1d02b
pdf-font-stream PDF embedded font (sfnt) at offset 0x131A1 10724 bytes