Malicious PDF — malware analysis report

Static analysis result for SHA-256 694f9f1d14549bfd…

MALICIOUS

PDF

68.2 KB Created: 2021-09-05 07:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 83fc2dab66556f9432160ab02358ae5d SHA-1: 9e9e2bab883adaa56a2a7e98be76ff15ad244802 SHA-256: 694f9f1d14549bfd27eccafcb277c27b9dfeaa75847b7213a545870a440bb850
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the heuristic firings strongly indicate the file's purpose is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9130

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://artikos.pl/userfiles/file/14323395817.pdf In PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/11f3a75f857b0d82c518583fb08c4f01/bimubamuwajuxareropixi.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/96004578311.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/zalisebizoweginubazakif.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161108dd0c9c49---giruwunuz.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/45515567622.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/556904011f9a5d6ee1a6f024ae2caca6/54148535854.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/60018089353.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/zugunojovabilivujuzugote.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/jojawodenutemuzasafiwe.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/fimemimararunu.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/mqiae4cgrpd201rp3htu9uj01n/13419246040.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/57893112804.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/49174281565.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/jixopasunogerukevag.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608578cb7f143---zekijenuvalulegibor.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/f22423edb5a4b35c12a59a1dfbf1fc87/fekabilisanozu.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021050411150473499.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853b0ba4941---93851172852.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/c0dcf4cd5294bbe9be07ea064b80b07f/58973811182.pdfIn PDF document text
    • http://short-story.ru/upload/file/mubigozobisave.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2af9859808---xekenuzuzunitinunitope.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/xesemadobugetewusaju.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/nanoxagonirok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=farewell+to+arms+sparknotes+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_off0000db08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB08 10720 bytes
SHA-256: eed6c61050573ceca501b482111cc6f74dba9d06938f9ebbb68c2af4dfbc2326

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