Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27553b2ca29c9d2…

MALICIOUS

PDF

134.9 KB Created: 2021-09-05 06:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2165f812a4c381c1b3aaaf8b43953d38 SHA-1: 50aeff35b2ebcd9e4f98c3d059c543294981ff7f SHA-256: f27553b2ca29c9d2598ace6eebb62b807743f9db664c8403b68c4b5fdd35272d
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users through these links, likely to a phishing page or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6449

Heuristics 5

  • 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
  • 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://markasib.ru/ckfinder/userfiles/files/wajizugodopufenaxoverin.pdf In PDF document text
    • http://ridendo.cz/files/file/nesubawetosame.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/90248024665.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c063052109---81417776964.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113839f7bfcf---xirowonefevifizubade.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/29657056264.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/40675574937.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c1dbf8e8b4599749393c5d21f4b502c7/9185346735.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/vawanisoposiwupujuxagide.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/63ed5b493e459b1fa6e6b668aa936844/8671476858.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/9f1596266382eef00025e55037110ec5/99432233137.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/t502cd1ne5q5g6rp2j254kspb5/44842322089.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/49902363690.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607154ee7c293---56604181749.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/pejam.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/pasuraranol.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160be8b3fb491f---89528587041.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/50818067665.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c157c048a---jorotipunisoxal.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/4206585968.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/2371904368.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/1d6677aac5d6eb6e7b36c624eee46617/detazegukivilu.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/54e8094268bd9ce21faeb9f3dfd09d0a/99544785991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=manuale+di+officina+yamaha+x+max+250+italianoPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001de1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1