Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d3d9afeb304cf5…

MALICIOUS

PDF

86.2 KB Created: 2021-09-01 19:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3346978dff05c8c9c0b7d591e2a6d08b SHA-1: 86a90d03bc939a33a3968af6e1768e0b47db0eef SHA-256: 38d3d9afeb304cf51c9ca69e084a61594c5bdc34d9febf7dae4f75e2f199cc77
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a link farm pointing to multiple compromised WordPress sites. These links lead to other PDF files, suggesting a multi-stage redirection or download process. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5b0de2c4f---xelamosevetes.pdf In PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/325c96fdb53851674af85a49321e95ea/xovebaxukidobiliwi.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad89dec037d---58243624840.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/3cf8fea28611c87c79b60aa5d7bbc6df/12493762455.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/31122285985.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/61798383808.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/cr01p78bsp2t80b7o2gende8e4/remijiri.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-1/20210601234259708453.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/60166267386.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/ce1cc18604bb791786bd2186b2f3f752/61820626965.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/65733ce022a616289afcbe42075aba54/fivupe.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/30225475259.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16099a3f784981---39849802476.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/c73dbdf606a2b4cae327ecac800e5da8/34415826582.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/867e4ebbeafc8fabd14f962a372e2a71/86537896907.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/96699020018.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/9293454817.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/ec892a0b74e8711f82fb94e2bf498458/muvibolixujejad.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/refaru.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/neguwoziduwadivaj.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/vadefoxuxoken.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/fasidb93kl3588nq9glfp5cmqg/41839331058.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/38161401795.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/rawujofiwesufa.pdfIn PDF document text
    • http://reunionfamily.com/clients/6/6c/6c58f7de0247188f02debbcda007d80b/File/99242931994.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/jopusevipijimiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=recovery+franchise+marketing+servicesPDF 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_off0000ed65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 16956 bytes
SHA-256: e5d7270f62e279578d70037a1ca73e04990ab5cad73b3f130eabe68a133d9b07
font_02_sfnt_off00013103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13103 11052 bytes
SHA-256: a4a53ea16f8781080604aa3d5524962033ebb8678bb1136aa81633bf1651b49a