Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb3d4d0f6e81bca…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 09:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bacff6d701a6752dca5bf40830b85552 SHA-1: 2e8070b202e13d680b7ae59edcb73e314e8808b2 SHA-256: 8cb3d4d0f6e81bca1c44cf806e9e6ae1ad4854a69d71a704da56f08fe22a315c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5305

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 https://synerhu.ru/uplcv?utm_term=laia+2016+watch+online PDF link annotation
    • http://belovosushi.ru/files/giwipewide.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/27872156899.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/muwoduvilibuvesiw.pdfIn PDF document text
    • http://strategieb2b.ca/userfiles/file/78106247956.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/pevutorudulolowir.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/tokimo.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/wimubupebivukezexopo.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab9fcc4a0f---rizebubexegeraxopagefo.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/kitanorizakazavisepirexov.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/lajasaparim.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/74514654060.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/wuwiwumen.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/88555140119.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/feguvadedasi.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/37063124097.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161301f4c24388---19929740800.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/36414370165.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/95236350910.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133c9644e63a---85949126182.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/mijanamamet.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/3r5kmg9hpf24hbka5fdedtf54k/kizakeluvewupokukesapim.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_off0000e5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BD 20356 bytes
SHA-256: 06824c656ce5ed02234585cfbcc2fc2162f73a73943b81a914670802827a2a21
font_01_sfnt_off00011a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13267 10564 bytes
SHA-256: 927a460d39ba5ab8b6908f80640986a25f685eba75c4f01ab67e5dcb07f4aa64

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