Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c92070c50af38d9…

MALICIOUS

PDF

84.0 KB Created: 2021-06-27 01:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 622f319608b1585bc7d12c7f8b7523de SHA-1: 7464d98e36ec2e8281dd6d6be5cabce16733505c SHA-256: 1c92070c50af38d9bfee7f209b694d11b4a936b252be80a1fddb9d8ceb5ad0e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the links indicate an attempt to lure users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=fried+green+tomatoes+book+vs+movie
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5e4cd38b---27923992614.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afe27779ffa---zemezugeparunefoginiso.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89b07b8f48---80391303916.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/saxevuxugigetaxak.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084630d60384---vavixejafixuf.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f3f0ec320---9467082011.pdf
    • http://novosib-sport.ru/ckfinder/userfiles/files/85600856672.pdf
    • https://jamurgoreng.net/contents//files/79824245599.pdf
    • https://asthasupermarket.com/userfiles/file/19766070980.pdf
    • https://namdolove.com/FileData/ckfinder/files/20210528_3222C654363E94D9.pdf
    • http://hanifeugur.com/image/files/batujajavajewon.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b3803c5b779---maverilutoj.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/9071ed8aa8303ff86c7834887a632c61/99382080994.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/1ca7f618ff83ffbca5f97c0b105beb86/76584715230.pdf
    • http://adria-ex.com/images/blog//file/64436658334.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/ktlsnap3tc6q7cudg7325lb67i/debiwililexokan.pdf
    • http://cancercareresearch.com/userfiles/file/94455403838.pdf
    • http://fotossc.pl/_files/file/tobiranalipovena.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eeec9e4ece---42466592089.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/46fc9d33aeff0cb7eee6fdbd52cb657c/88336347674.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a4923734442---rukifenuxokaxotosam.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_off0000e443.bin
7ab42426619ae39665d59f67218a6925d75b4316969e45fc38855f50afe39ff9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE443 17472 bytes
font_01_sfnt_off00011216.bin
1a9630962d2bf043067b2586b4fd7a5526a274d351e2deb59d949f6cfe9522f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11216 10820 bytes
font_02_sfnt_off00012ada.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADA 16792 bytes