Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0d022e43a71702…

MALICIOUS

PDF

71.7 KB Created: 2021-08-15 01:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 69e2f57e59f00c7f3e06076b765755f3 SHA-1: 50c0567fce015d2155a9a818edc4cd29c0c32248 SHA-256: 3a0d022e43a71702f47b466734cb9cef2a44e30398cdf7b52fe2a3f4f31ae70b
154 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites. The document body was unreadable, but the presence of numerous external links suggests a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9414

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://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ab8e864a8---dukuwoku.pdf In PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210628192759.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16111c8ff9d6f1---fafubunisutapotu.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621561301.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/52424186430.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/97827425245.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607856fa4b59e---mefogan.pdfIn PDF document text
    • https://comfort8889.com/upload/files/dakize.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c19fd67794a---72556445788.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/dibimitowuje.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/18220314114.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/jenpmtl5eru94bmaash8ccl4c1/16933439540.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/10435320425.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/88000806081.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f095520a0e5---6226390543.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/96033595893.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608061e3bf957---50225798344.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bi2marq9pag78k5hq5tm5993f2/sebamapejerosowemonugod.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/sipewevadasidilujakiwesa.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/16191624952.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b74152a871f232b992bb459cc838bfd0/lozipuxarasiresivafagi.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/visojegumijexub.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/pazuwezejivekejes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=modern+chemistry+chapter+6+section+3+review+answersPDF link annotation
    • 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_off0000ee16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 17352 bytes
SHA-256: 36b42d9e5c81ff94e1f0fbf8bb482c7526e6450cda7e61a760dc42dc217ece11

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