Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68a35b7f711d55e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 14:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4b393a24f181b2a12d018ed5d84e18c9 SHA-1: 46616c8462f5d5e3382838a8715ec0b46e50a993 SHA-256: d68a35b7f711d55e92ea78329d000cdcfd66b960e1911e02262797dbc4e8ea22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of numerous external URIs and link farms indicates a phishing or scamming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://chcial.ru/uplcv?utm_term=gps+symbol+copy+and+paste PDF link annotation
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/3aef27276cf97fd373a3a814c4e5178b/rosaf.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/97038164255.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/mubopozogiwajogus.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614202cbf1930---66499925585.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/52616832700.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd4de1fe92---didorasukiludadoj.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/kivuz.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/61487898950.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/wemituvuf.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/supazujabafuworiguvewemof.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/xegipatarosinefilag.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/jj1f08895i2i9k9btce6kmt3ae/bamizusupidoziwekaf.pdfIn PDF document text
    • http://erex.hu/upload/file/xesejenen.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/zalirojukul.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/4796475216.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/8852040111.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/kipezatejupudafogiri.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/a2f6ad036961a251bd95b2b8a7014c9e/visizatabuwobulidi.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/tewonaj.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/vawugimek.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_off0000d32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32B 10776 bytes
SHA-256: be74864f64d9e8677ac663d7c507612b3cb19980efc8af5d8ab4f5cf8cf4624c
font_01_sfnt_off0000ebd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EA 17976 bytes
SHA-256: cf870ca60d2bc3b10c1e51afbd3e07fad95ca0ef6389fc1229d0cc3d6f0ba540