Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0baa0c0868cb65…

MALICIOUS

PDF

55.6 KB Created: 2021-09-28 18:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b3758ba29af43ebbfe36833150e1e554 SHA-1: 848f3bcb33220610d9731dc09ef06fdb403af351 SHA-256: 5f0baa0c0868cb65940ee8e7676ec1e1cef596aad010c5acbcf31d3a1e1ceeb5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ClamAV detection and ML classifier indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded URLs and link farms suggests a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6632

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://crysiq.ru/uplcv?utm_term=promemoria+compleanni+android PDF link annotation
    • http://www.fuchingrading.com/upload/file/kazubitalavu.pdfIn PDF document text
    • https://tdfstore.it/file/44238544357.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/tevonidinomatov.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/b76c282a5b38b51bef247a250c7113f4/77011884527.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f57d0d5b9---biremizozikamosubip.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147337d322c6---rilosirefabisexokaneniwiw.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/74590199263.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210922220339.pdfIn PDF document text
    • https://trystsalonri.com/images/file/sekenuriwidadefefagavi.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/49370714961.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c4be740e5---jagaxomijavomumizawewuxa.pdfIn PDF document text
    • https://negaratoto.com/contents/files/92429826355.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/38464798012.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/37120040899.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/70535964425.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/pupanidoruzasurexufinid.pdfIn PDF document text
    • https://ww150008.linebot.net/upfile/files/20210921192735.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/83305712141.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/29101160143.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/binowizepuva.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/juzimi.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/91499358666.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/78444459238.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/goxasefozakezogatapef.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/xadakigepazizovofarawe.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/71430994068.pdfIn PDF document text
    • 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_off0000b389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB389 15240 bytes
SHA-256: d7fd539adf1e2847d5c11f62806c23a2dcf7297568cb47633e8955c552e0bd3e

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