Malicious PDF — malware analysis report

Static analysis result for SHA-256 53adfa425d8f9c1d…

MALICIOUS

PDF

80.3 KB Created: 2021-08-18 14:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b03a4acada3ac6b1cbdea302591feec9 SHA-1: 7d94653d4d329c8cb1593feb20038efbf1b1c408 SHA-256: 53adfa425d8f9c1db936703ee46bc13d28f8338356fe3581e5b041d1c74320cf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or exploit vulnerabilities. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=ion+color+brilliance+powder+lightener+mixing+instructions
    • http://leaders-adv.net/userfiles/file/50721813799.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608205b025acb---worumujobeduzokefo.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4ac089934---ruwemos.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0037b2fd4---70193513771.pdf
    • https://coonvalleycc.com/userfiles/file/kewukonowa.pdf
    • https://bangprice.com/bangprice.com/beta/cms_image/file/zawapovazogomekiwik.pdf
    • http://geraldinekilkelly.ie/guzodosuvuxavexuju.pdf
    • http://partnercable.hu/files/guvatofofovivuw.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff64c4d58b---tefod.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/4d448149a2defaf8f782ca11c333059d/lokiguzalilebapebojopita.pdf
    • http://chlahb.com/uploadfile/2011/new2011617/files/2021/08/20210815074802.pdf
    • https://szekszardportal.hu/userfiles/file/36594107698.pdf
    • https://afayl.com/userfiles/file/39443000703.pdf
    • http://www.findvoters.com/userfiles/file/rivelezejepudikomileti.pdf
    • http://incomsistema.ru/ckfinder/userfiles/files/rimile.pdf
    • http://richmediahouse.com/admin/uploads/file/mugevojupasatosotij.pdf
    • http://herium.net/FileData/ckfinder/files/20210722_A1F3B3052E45D515.pdf
    • http://billsky.ee/files/file/vovusewofaxosalonutosozi.pdf
    • http://eluvial.com/sites/all/sites/eluvial.com/files/jidivusaferagusenasexinek.pdf
    • http://holidayservicemarsala.it/userfiles/files/kizejujagemoxenug.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/jomattkon4u3lf3607at21u2u0/kikufazoxusisix.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a85926d0216---xapuromawumavolamin.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a777647705f---80347111377.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_off0000d25c.bin
2dc865fdb49d012abe50b0565b613a24c044348feb2275dff97c556f5f0a42e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD25C 11340 bytes
font_01_sfnt_off0000ec7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 16792 bytes
font_02_sfnt_off00010491.bin
4625c5f6da749a99339fb28e2c913e19bbcf0891321ea432583f96b88d5c4e8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10491 17228 bytes