Malicious PDF — malware analysis report

Static analysis result for SHA-256 858ce26565877786…

MALICIOUS

PDF

73.7 KB Created: 2021-09-16 23:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f6909a5771b4522880492aec9eeb22f3 SHA-1: f09a225bd9625fc75470e4ba6c73019f2213cfdf SHA-256: 858ce26565877786a0bb0af1221ed49ed52a6497a7c4614ae972a05592d39e95
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable domains, as indicated by the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ClamAV detection further confirms its malicious nature, classifying it as Pdf.Phishing.Trojan. The primary attack pattern involves luring users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

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://fzcce.com/aimgs/uload/files/ruvukimikozobovetu.pdf In PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-6/20210906130707220408.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/wuwagefikulokef.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139cead709d6---kuvum.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kutepinetozuzi.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/tubupogugazuni.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16137a51adce24---medutelosu.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/lulubirefuvonikisudavevo.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/11983788414.pdfIn PDF document text
    • http://planetamama.ru/files/file/xovoretivopanuvilog.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/tejakare.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/gomovakijak.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/5472515533.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/kuseberabexigitinile.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161321adfcb1df---belofud.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339a978f4b9---vadaramarunogerozebezox.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/bunujugizikovebotodimi.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141455f807e8---xutopefagapupurafiku.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/2c4304e7de057be67f9f7bc90d7f745a/vixobuvefozaje.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cee952865d---70136608997.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613023932b120---5287331817.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3564530f1---61789082702.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/tafedimanilajopefaj.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fad7b48885---jimoxiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=system+update+mi+a3PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD4 10644 bytes
SHA-256: 70b8b35d3a01a4991ec1dc4e695b5ad5a046af4ac8470058eee93da4242dab71
font_01_sfnt_off0000f644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1