Malicious PDF — malware analysis report

Static analysis result for SHA-256 423ef4d2dd340eec…

MALICIOUS

PDF

65.1 KB Created: 2021-06-10 19:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1f9f559042a08c814d247cc3b5ee0a17 SHA-1: e0478a11a2101279fd1ef527101b44fc10904008 SHA-256: 423ef4d2dd340eec89077da69aacf8cfa2e6104f94ee7a12d6f31ed1ca22b214
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, pointing to compromised websites and potentially disposable hosting. The URLs suggest a lure related to downloading software, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8602

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 https://archism.ru/uplcv?utm_term=free+vidmate+video+downloader+for+pc PDF link annotation
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/e4rej1js6vvv7i7l1cghds4ef1/26630902600.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/50362715663.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cea947ababb3f1ae1063e91fbbbeb70d/72695948561.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/93843136333.pdfIn PDF document text
    • http://unsersohn.ch/images/file/33257329998.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/4426e20e5ee513b91e94fe76db8fdefd/duxaremilunu.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bdb342413---11910719887.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/43707346426.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/59374764788.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/995p9iu9qtg2pm94rvladi2a3p/linejonepisedib.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/fexiwonabugufutulu.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/xexawurazugisufafu.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16072e903dfd35---92627400428.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/8u2gnr2j3qkj08c4a9cnp51e61/63272213437.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2cf126f43---49712561448.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/ropolinewibolito.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/torarobuwelekem.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/vrkmpitobbet8k6ua4q9v9psml/19375604922.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854b5001dba---dijod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 5232 bytes
SHA-256: e830986577aeb3c483711b2c391fc98f2d5486b5347e362f6a81be0d77947861

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