Malicious PDF — malware analysis report

Static analysis result for SHA-256 7750fd30ee589303…

MALICIOUS

PDF

78.1 KB Created: 2021-09-16 08:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 92322a6ac762a21609582082a861514e SHA-1: c8e3fe2bda6b02a09964d831bdf469b97ebfe300 SHA-256: 7750fd30ee589303f193cd3fac2009f6faaa3fb6729809784158ef8d659f5b96
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://rezidencianestor.sk/app/webroot/files/ckeditor/files/figukawomonif.pdf In PDF document text
    • http://juha.be/_files/file/wevegusifopaserukose.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/zegumonujelelakegur.pdfIn PDF document text
    • http://carbonelite.ru/file/64840832315.pdfIn PDF document text
    • http://4rrecycle.com/files/file/rekedunuxuduzumiboral.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/suvikazipulojepezit.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109111059533239.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/kikotuzofonusogez.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///rupisewofiluvetapokoz.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/2396227452.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/zukizavetu.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/fabovure.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/16c082c6e6de5fd04a4551cc20f4b5d1/53316484578.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/36338159415.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/rrml0dri2a574l821ttl15uvl4/25695994247.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/85183813128.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/5050584016.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/paderewesododuteja.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/6f12681f4a1c96544518d22f45049539/15311332972.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/58061478754.pdfIn PDF document text
    • http://cl-pub.com/files/files/pimutaruw.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/94653974060.pdfIn PDF document text
    • http://nemochem.cn/upload/files/54054384564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=vikram+vedha+watch+tamil+movie+onlinePDF 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_off0000cc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC75 17580 bytes
SHA-256: 41ff0011287949e1f6d3a5d64bfc02e1e8d1f96d11e42ee9b06fcb1fd72bc78b
font_01_sfnt_off0000fa0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11221 10680 bytes
SHA-256: 79ca61c80695841ed1a293df1f578c95915d99a0df9509d03455e6173892b202