Malicious PDF — malware analysis report

Static analysis result for SHA-256 767628c0a0486b66…

MALICIOUS

PDF

91.4 KB Created: 2021-07-09 18:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e6fa3857bf39215a3871a0b62f011c43 SHA-1: 783c50dc1aa846d668f06a9ba4cb4149d268e618 SHA-256: 767628c0a0486b660316ddcbe2afaa827c7e36cf7033eb0fd8c5b446567473de
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs are likely part of this redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6763f88132---79306191715.pdf In PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1663cdf99b9c54790ac10098471af565/zokit.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/35010861876.pdfIn PDF document text
    • http://nakatka.com/files/file/93998512560.pdfIn PDF document text
    • http://hrudolf.com/userfiles/63453028149.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/fed7861cb7fb58b9c25da6e48a9f0a6e/59027876501.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/miwusa.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085a8fcc8550---81663079314.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/ru7c2fkthe3hs80an6imnlu3ek/jaxosixegulapi.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608088f593129---83362611278.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/kujigujizizubusa.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/86902164304.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160726030e1f05---sodaripasezenopig.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b60c37b22ac---77217362242.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/p4iqh3pg76jrf40vdd3dmamcd0/kabagakapekuxogivisu.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2aa880b26---6132953995.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/dgd8fm0a6r66oe8m3dn7e5ls64/75367635493.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210704061825.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/87151552053.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c21addef---28789732888.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/babalidudapevo.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/007334aace72e175b37fa992c5725a6a/87347347744.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/2685488246.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/mopujaju.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bff31046625---zimeguwimobag.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607433329ed2b---dozikunutaxajozela.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210629111714_1d4uma.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/59201739431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=contrast+colour+for+light+greenPDF 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_off000100d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D2 17900 bytes
SHA-256: 265f3c4561ba9f6faf0973f5780407a9998e711029045110b9c1a83db00b59c2
font_01_sfnt_off00012f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F44 10744 bytes
SHA-256: 3eb76baaad4d510c9462e87d0c17e236f0c0d2dc28ebbed4a3f74ec6a301f873
font_02_sfnt_off000147fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1