Malicious PDF — malware analysis report

Static analysis result for SHA-256 786a94a449a05605…

MALICIOUS

PDF

81.5 KB Created: 2021-10-09 05:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 547319adebd635cf13be9233c50beb12 SHA-1: ead94c194d40816eceeb152ff4af5cd5039895ea SHA-256: 786a94a449a05605dd66d1e53e862df1e4ed3a341493bf705334f1d95bc7782d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple external URLs, many of which are hosted on disposable domains or potentially compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links to external resources suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://creativeindustries.ru/uploads/userfiles/file/nofonibuduxorelo.pdf In PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/51736456947.pdfIn PDF document text
    • https://southafricapools.com/contents/files/24658459254.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/90603349839.pdfIn PDF document text
    • http://ladna.pl/user_images/file/lerifole.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480ed7eba45---20198304129.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/19532346120.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/76205002541.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130b482421fe---lisejibumarekarogelije.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/dadaloj.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/kavawubuwowiwoveg.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021092404040460.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/xeluwer.pdfIn PDF document text
    • https://atarentacarburdur.com/userfiles/file/31940787687.pdfIn PDF document text
    • http://momsystem.ru/public/file/90922778588.pdfIn PDF document text
    • http://irc.kz/data/content/file/newurivopaxonimogopudi.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/bijolotew.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/lonasegixe.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/tobapokakogi.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/38cc7a9f58a736ba284632cc21698ce6/73659438779.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/9bb655873cfae71bc6ceaa4b2195a2cf/19850801848.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///65524361034.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/donizus.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/wibowutasinajusalejawiniw.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/70734874482.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/17619815761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=name+the+solute+and+solventPDF 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_off0000db96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB96 17832 bytes
SHA-256: 57b7ff26fbad9867fee66909aeb7379db6ef351bb6f2ef2e40f68ec7e45edb70
font_01_sfnt_off000108d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D9 10464 bytes
SHA-256: 5b0e6dad43af99c04e608b0eac29e5085f88aeecac6a80320829577114976fb4
font_02_sfnt_off0001207a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1