Malicious PDF — malware analysis report

Static analysis result for SHA-256 863f9bca4e24be34…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 06:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d0259cfe181d8a00b32e4f3b485679a9 SHA-1: db0a78995ba4517a0817ddf7377718681925781a SHA-256: 863f9bca4e24be346f86cee1e26cdf5b00cbdb4ee545c35d9229c3c43d655287
124 Risk Score

Malware Insights

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

The file was detected as a PDF phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. This suggests a multi-stage attack where the initial PDF serves as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://poltinka.ru/userfiles/file/nifazufawivenizake.pdf In PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/7030409081.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/bafes.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098d9e03a152---fupoloseguw.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/xupulora.pdfIn PDF document text
    • http://parquessolaresdenavarra.com/userfiles/files/pubemuzi.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/vpgttv75shr8q0tkqqeqcr8c54/wijusafeminojuxopewat.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/22925288491.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/36102043084.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/810c3977a97d357b4ed3c1a5fca6bdad/rikugupezazuvemodepi.pdfIn PDF document text
    • http://billsky.ee/files/file/ronamemigilonu.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/ratofu.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/40971910440.pdfIn PDF document text
    • http://conroeclassof72.com/clients/d/de/de0acc14889d5d69ce6a2e221f3e79cd/File/kogiwemopigalomevup.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609645bcdf6fc---jajogex.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/80768442506.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/fumesusuzojopebida.pdfIn PDF document text
    • https://viettrungson.com/media//Files/sopaga.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/13876413039.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/38139074217.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/40085987677.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/f9e377f3a4095edf077a5202f35f8c53/88712960534.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/kofiwuladibaxeluz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pdf+reader+editor+free+downloadPDF 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_off0000eab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB0 10268 bytes
SHA-256: cb4953e2ef26e1b4ce1c0d0f80ace4b199537e5eac74fdae3a200e845b03bb48
font_01_sfnt_off000101e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E9 18612 bytes
SHA-256: a5af60a3978b00b56c8372f1f2732477fd0c41c9bd17e53b796c7940a8a715d5

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