Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe3af8d00e86c99…

MALICIOUS

PDF

85.9 KB Created: 2021-09-07 17:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8a0afa8daf44871f5fe15fb829897854 SHA-1: 1136e3e7e0471edb7610c7aeaab510b54128af07 SHA-256: 9fe3af8d00e86c9914ea9918d702166240f0a1fcdf10b785fe19ecbc2daee24c
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable domains, indicating a link farm designed to lure users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5823

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://rungrawin-itt.com/userfiles/files/mawukekajatowor.pdf In PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609e12073090b---42629826711.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/90450411480.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/tinasosijamatogesapewisa.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/sr35m56brl1febmlpafro1bb1p/dafosivejota.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/78620076325.pdfIn PDF document text
    • http://gibisch.biz/files/files/teditalod.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160aaab37f3274---tulanojes.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb60df3ef48---logakaka.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/b7847ab32e75e0114a5bb891bd9d13a0/8121067088.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/1302ce03e49ad13cd03a6baa2ca3f788/kizeteroxuporato.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/tuvema.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/52356725408.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/53e53187fa2d3f9d2bc01de100b27ab2/sukufazixasev.pdfIn PDF document text
    • http://azizolace.cz/images/file/zilopapudadulopemolakalol.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/kvj8jrku4ffsre6r3cm2rghpt4/tefozu.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d91842a95a0730a5f544d51029263849/xogoda.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/kokowatosope.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/69760776486.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/29761375471.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/vidumulud.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/9713640689.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/90758097391.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/44890441533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=courants+litt%C3%A9raires+pdfPDF 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_off00011be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1