Malicious PDF — malware analysis report

Static analysis result for SHA-256 0350310000bb50dc…

MALICIOUS

PDF

101.8 KB Created: 2021-09-04 19:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0880b28f6266ffd4a66b2d98c4a84fad SHA-1: 69cc0aeb24d508a2c63445d68b95f3448fb28aae SHA-256: 0350310000bb50dc6052713bdad6652f6a4c606aa74f5a2fcc81fa55d4053fd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and potentially disposable hosting. This suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vegojuxomebezex.pdf In PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161169eb2b7f36---96782551683.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/6e09b76a5db4d798691b809e15b9b451/63207018339.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c97a585e2ad---50730201017.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/1ikguvakdecrm9021eqrkepd94/18259940020.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/98053765643.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/55118736204.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04888e2540---vidapifazofemozasuwi.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/27900308988.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/ziratimozekepiwixarokal.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/e2a6eb7e35cdb58e07a0934d78a393cc/nobodazotowujevuberi.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/to5t16hgn51agp0ej709sbqlf0/95899560035.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/marefozekixofoxojez.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210706110019.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/53751754567.pdfIn PDF document text
    • http://24cvety.ru/upload/files/52199338455.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/eskqc9e8jd1jc8bps6f06lapsf/60184338068.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/d62bpb55bm7edu5hrjiinsq7ha/93410212455.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/p8rb6ggnuu0e6knqkueta9c892/werogozixog.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/telejuxopapuwuxavegofekif.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/rokagor.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/gewagiwurawedekeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=geladeira+panasonic+bt50+manualPDF 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_off000120de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DE 11212 bytes
SHA-256: 84dc1228a26361ddf97f8c599aa378f4511176bf0c8eefc72fdfde815b024383
font_01_sfnt_off00013ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD8 20176 bytes
SHA-256: 1548df6af3c404b0955b82f6e4a3c20b4335a241a0981ab78eb8bed779b7d57f
font_02_sfnt_off00017051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1