Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef6814efe479f19…

MALICIOUS

PDF

65.1 KB Created: 2021-09-05 19:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: daf4691294fac90dead1dce620aa06c6 SHA-1: 941697faa71cc0e5387930860f38a995e3ebb136 SHA-256: 4ef6814efe479f193ff7c47b32febaa88705cbc111985ce298486f2e98f90159
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS upload storage. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit vulnerabilities, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9620

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://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/a8ab4e93a65d981072acea39333d5193/29022731853.pdf In PDF document text
    • http://ahcxdq.com/uploads/file/071150423373.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/f7b5b6d2b772e8eb762289b72696bcd3/19032046471.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/41431412608.pdfIn PDF document text
    • http://prograsifkalip.com/files/fubozuzugegimojaxexejasoj.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/40928864166.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e352d99dd2b---samig.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607177d2b8a67---fozetumuwowi.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/silemisupexosibonuvomeduv.pdfIn PDF document text
    • http://bbu.vn/Images_upload/files/37667598523.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/94701353938.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/88678080011.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610e8e62ae206---58175848455.pdfIn PDF document text
    • http://henrysadiereunions.com/clients/876463/File/64730152158.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210627153705.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/febuzul.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087849914da7---99200434119.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/vumanututukinumavod.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/65964370963.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/wifuvufawuzexizudisan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=cerebral+palsy+ataxia+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_off0000e53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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