Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79d1156cc12150f…

MALICIOUS

PDF

81.6 KB Created: 2021-07-05 17:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23dc040da27981e55644b3df0b257199 SHA-1: b90bf4a698ebbd4a431bedbf5e6c97113dff93f4 SHA-256: a79d1156cc12150f82af017d2c0e4b5dda3bfcd6bcdc8d63f87f6bdb192bc689
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of links pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/1okab4blu6jits8vthls35tj10/71745238404.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ct3io8jv3jvbrmr41oiimkjjc1/11610739744.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/bf7bea4fd9bade3481efd642852b3bf7/pisoxuzumixup.pdf
    • http://geometrabottero.it/userfiles/files/42411201636.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcc10b79e7---xafat.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/vt3kl0e94qk3b607a9rfmhqph4/19743611618.pdf
    • http://thankschicken.com/uploads/files/75664367505.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7fec1a1ef43e3e1e460fcd2a99ff7071/nelulosozo.pdf
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/34a7da65e90f73fbe231aecb97bef497/22049458359.pdf
    • http://lhsclassof77.com/clients/34792/File/73140400319.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/00a0fb597e0843da8a65f6ad4b45aab9/tavagoburixu.pdf
    • https://f27szerviz.hu/upload/files/wabipuje.pdf
    • http://ventmetal.ru/userfiles/files/xemotolubajo.pdf
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/sadeponabakagof.pdf
    • https://codecs.ro/images/file/nireboxijozabu.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/n9tab8ke2ksfsq0c6gbve5sggv/wiraw.pdf
    • https://immobilgold.com/file/pulewutin.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/60188573152.pdf
    • http://everbeenmagnet.com/js/upfiles/files/giwinefidorelusamogev.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/jk1hgtfh4b7grs6gfba6hlqnc6/45650936795.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6c75d7b0e---xalezu.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a50625a0116---85051279723.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=all+for+strings+book+2+violin+pdf
    • 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_off0000da38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA38 16792 bytes
font_01_sfnt_off0000f24f.bin
67e8be6b901a2ea0436bebedd8ed59168a5ab8d6a60b993a966bfa9394ca3f61
pdf-font-stream PDF embedded font (sfnt) at offset 0xF24F 10780 bytes
font_02_sfnt_off00010ada.bin
e8bb5a7acb12f65a50979021712a6480ab009b2883dcb8f9ad1121e425335d95
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADA 17608 bytes