Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f41d74bd26b698…

MALICIOUS

PDF

48.0 KB Created: 2021-09-02 15:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dea6239ee9d038412fa8d260a786cad2 SHA-1: 7b749e18adbef5d185ed8210a1822403a13c15f1 SHA-256: 63f41d74bd26b6989569cd9e1ac51cb2eb3ffcda7d433c72d41121735db48e3e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers also flagged it as malicious. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8101

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=gujarati+bhajan+book+pdf PDF link annotation
    • http://veterinariomauracotti.it/userfiles/files/18684300473.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d55d5ccf3b---wizobijedawojinaxedodeler.pdfIn PDF document text
    • https://brs.jo/userfiles/files/fakitatume.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/49699221878.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/neroxikududozekaza.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/buwetigefipigokubisevafob.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/lqs90ruf43o08a98a1t6b3mfah/metotafik.pdfIn PDF document text
    • http://melabo.com/upload/files/39043138772.pdfIn PDF document text
    • http://123dvere.sk/files/file/6471637642.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/pigapenuzipudo.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/b5ef4411bf690cdda41eb65b49826d58/24049834305.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/ededa5922d0fd9324040aef4cc715c90/duvaletovuvaxetutuvoduzur.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/16717962197.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/rebudijasutupakotim.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/66458969011.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/10104272321.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/b6cd1cd3960466fb51fca9c0966e5dde/pogejunigobexixox.pdfIn PDF document text

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