Malicious PDF — malware analysis report

Static analysis result for SHA-256 b34ff57dbb3c9384…

MALICIOUS

PDF

63.7 KB Created: 2021-07-26 22:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 37b7e909ba7cb0c2d363edec1f1f6d2f SHA-1: d20c75c49a9efa59711d050f1fd20c389fba3c4e SHA-256: b34ff57dbb3c9384af9a6b641647076989fdc22734584c744f5b6471abe93485
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6520

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • 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 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://hopkins1983.com/clients/861771/File/memezinosetisokipovut.pdf In PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/sebadikusopodalivofufax.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/sozekus.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff4920ff12---bekonipikonov.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210707215625.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/6373926850.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/5b63893920a983d1a0913d1f9ae7d720/37912185957.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/7600055643.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/bm0pghsl6mkoq7ierlckvf5kfp/musozugizuwo.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a918b04beeb---jasesumozezudujifunuja.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a97f1908410---dasogafunipoloririzovage.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/papaxudojujevuworekuju.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/72722812316.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/xekubotagoxopux.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/77d51c529b05d8de39178757c4928725/mubozigomukilosinewabuwo.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/84569314441.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735b4e51f53---17448889577.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/zimetezalakapegi.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/mapetikolenisovilujut.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/f5a2ddd9fcdea4c0a9524bf0b8ead5eb/66018543704.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/t8mtcv1sn8sj37mcqbbplitnk7/73886393141.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/63557198314.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/24d2ef3dbc22cfcd990d727b9a71b10b/13653198583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=bewafa+hai+tu+mp3+song+download+mp3tau.comIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78C 16784 bytes
SHA-256: 17f121c1092de24300c886c7b6706f6b1f7124fccaf579c25a19bae1a6160743