Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e1bf06f7ccea694…

MALICIOUS

PDF

78.0 KB Created: 2021-07-26 07:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f7b58beb8d6e8779526fa3452f70f765 SHA-1: f5781c1d1b6cec52febe56749e79a9c6ef5d5127 SHA-256: 8e1bf06f7ccea694d89e09c3a4a0b70f2ec931a6c4b913983d6188960233769a
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised CMS upload storage and other disposable hosting, indicating an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9107

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mulroyenvironmental.ie/userfiles/file/19661981785.pdf In PDF document text
    • http://candientushinko.com/images/file/74996454348.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/jotavobofure.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/tuboromomesuvisutirazadi.pdfIn PDF document text
    • http://dsraxys.com/uploads/kowisikerufafej.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/14973650089.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/61173237374.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/vabokulesa.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/36526470201.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/betusesugoninopebukalof.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/powuveki.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/43875464099.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/ni5g9skb0cb1sdcscrk6kgvf16/33249709215.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076cd64e83e1---toferebinilerupilubawepim.pdfIn PDF document text
    • http://www.celso.org/download/17845707329.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/83822442143.pdfIn PDF document text
    • https://kuepancong.com/contents//files/38431568883.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/39014363233.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076ac875404f---wexurabuv.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160984a14a6941---gutomoboxepulelagog.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/fasedebamiseba.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/91219028583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+bulk+up+skinny+guysPDF 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_off0000ffca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCA 16668 bytes
SHA-256: e17364e22c63af9b78898030b4e1184744ea0a7963a8d0a51c462d5bbe3531bd

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