Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63d07ba69dc0211…

MALICIOUS

PDF

66.5 KB Created: 2021-09-27 02:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1019463582f9bfae87a81d3e0960b6ca SHA-1: 111f92c1c38754c4c35cca447e6e6ba1fa485fc3 SHA-256: c63d07ba69dc0211337bc819ce7a50f227a4b0930497a2755847e4242854d0be
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the document's structure and embedded links are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4539

Heuristics 5

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://queure.ru/uplcv?utm_term=naruto+ultimate+ninja+4
    • https://designclarf.it/file/74680840095.pdf
    • https://akanaymatbaa.com/calisma2/files/uploads/4019410232.pdf
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/36130246917.pdf
    • https://cukimentescukraszda.hu/files/files/bemavopefelikuwuwiruf.pdf
    • https://uleshuzataruhaz.hu/files/file/juwelaxuseri.pdf
    • http://sake2metustin.com/uploads/files/589602509.pdf
    • http://jayeonrak.com/upfile_editor/2021/files/pepagizi.pdf
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/sowoziwi.pdf
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/28613850611.pdf
    • https://vmwarts.com/ecovic/file/mijafetulinex.pdf
    • http://dae-young.kr/upload/fckeditor/file/6948098958.pdf
    • http://abbeytraining.net/userfiles/file/42249869274.pdf
    • http://toptoptraining.ru/img/upload/file/97817255246.pdf
    • http://cen7dias.es/userfiles/files/fotivaji.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615036b5dc2cd---xebuza.pdf
    • http://vvk-wiedermann.at/userfiles/file/gizodi.pdf
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/77022623205.pdf
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/30681565675.pdf
    • http://beerskiboot.com/img/upload/file/5122683109.pdf
    • http://stepasidemedical.ie/images/uploads/file/60240647623.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/7199d1p9oe4gasesc68gfeuql3/zijesujupowoxilomojuke.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6ldnt7evqa8qf0mnu57slrt6c2/88192704972.pdf
    • http://wsm.hk/images/uploadfiles/file/44773640389.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b310.bin
4676bf123c2d0bfd88f53ab8aada891ae604af1004422c0a35ad7363cb840951		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB310 17568 bytes
font_01_sfnt_off0000dfc4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC4 16792 bytes

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