Malicious PDF — malware analysis report

Static analysis result for SHA-256 d742f8d8877ff39a…

MALICIOUS

PDF

98.3 KB Created: 2021-09-20 05:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0bc7fbc362770bbee8c59e6baf598e9e SHA-1: 0f8f9374d9dccfc6c9a89231b21d202579a635d0 SHA-256: d742f8d8877ff39a646773ae6798ad7360695e3fb552f3266a64fb93494f04bc
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm, with several pointing to compromised CMS uploads. An embedded JavaScript stream was also detected, suggesting the potential for malicious code execution. The primary purpose appears to be redirecting users through a network of links, likely to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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://pixomot.ru/uplcv?utm_term=rastrear+celular+android+google+maps PDF link annotation
    • http://phuvuongcorp.com/luutru/files/kijodizobop.pdfIn PDF document text
    • https://laser123.com/geektic/files/28070686700.pdfIn PDF document text
    • http://1careglobal.com/upload/files/55219240852.pdfIn PDF document text
    • https://jobtiara.com/files/files/7098542155.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/2151641052.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/zidizefewu.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/sugewopogigobekab.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109192028147874.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/bewifukatuka.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/susiwurofibugikiwosipuwap.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/faxowapuwuxaxagedovibij.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141c2c37b07d---57501170661.pdfIn PDF document text
    • http://xycrusher.com/d/files/13882753155.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/47888421303.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/38793122215.pdfIn PDF document text
    • http://apsons.eu/files/file/72557398847.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413b616aed3---giwobewikenid.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/87616004320.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/23588951707.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/pusugaderob.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/51458225293.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/04a4c2b040acec0bfde4610f90cdc290/26894826567.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-02/2109021456129163148w0npdru93ni.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/tabuzoreduzupamu.pdfIn PDF document text
    • https://pokereshop.cz/data/file/juwijemipumumofewig.pdfIn PDF document text
    • 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_off00011a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A73 11004 bytes
SHA-256: 8c2362fab1ffecd39263302af5818a304bcc1dbcb8b558cd9d4881034034bc34
font_01_sfnt_off000133c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C9 18228 bytes
SHA-256: 98878617d6e567d9e29ca150dd71ccd18a0cde9593414dd5e6135fecc04fd44b
font_02_sfnt_off0001632a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1632A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1