Malicious PDF — malware analysis report

Static analysis result for SHA-256 5298f43cfcb0f3a1…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 23:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5b69822630740102ebf6fab62141bced SHA-1: 28bc8a212c0be3ecb48fa31692c9ef89f5a9b1e4 SHA-256: 5298f43cfcb0f3a1cfedb016b094499ba15537948edb9e29cae32736c9e46484
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, including links to compromised CMS uploads and disposable hosting, indicates a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely involving phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://archism.ru/uplcv?utm_term=indian+idol+winner+2019 PDF link annotation
    • https://houstoncoinshow.org/FCKeditor/file/2083326276.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/80804375582.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/14334139347.pdfIn PDF document text
    • http://holzbau-napetschnig.at/39954378134.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/95650955659.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/tufeludefowegeja.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/92016306432.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/93830904671.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613097b0981e2---buvivavufa.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210912072128_lpwxut.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/66937432638.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/95757637249.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-9/20210909055929783664.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613894b0ae4dd.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/kajigibu.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/vepubakavulasifefowukiwak.pdfIn PDF document text
    • http://newshop.jp/archive/file/notagebufinotowawaluvadox.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/28287817776.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/15050451272.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/rodakaxaf.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/kamubitorobabukiji.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16139a8a08551b---pofofopikunagoruwumek.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/43122308571.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/93944387480.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE45 18536 bytes
SHA-256: cb0e5a0be9b5092a8dd09bc358058006087716346bf7a811d4e87ec4c8df88dc
font_01_sfnt_off00010d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001253c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253C 10476 bytes
SHA-256: 96b34795b46c9bf6b712286c7f03d1106afcdcc6ee13c07d6c954fb4ec3e055f

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