Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea1c0b2d0b124277…

MALICIOUS

PDF

86.0 KB Created: 2021-08-18 21:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b57a0bb36f83782ef164c6468cb84f4d SHA-1: c9a6433184da64e6b7069ca9a0922209039d7bd9 SHA-256: ea1c0b2d0b12427767f878b9d701bb7b15d8a020ea130e17986e890527bb8f99
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a phishing or malware distribution attempt. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to mimic an invoice or payment request, further supporting a social engineering attack. Although no scripts were explicitly extracted, the presence of multiple external links and the ML classifier's high confidence score suggest malicious intent, likely to lead the user to a malicious site or download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.sospapa24.com/lib/ckfinder/imgupload/files/38645339629.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3b98c3792---jinivedirijojizedufidifa.pdf
    • https://nutstudio.it/userfiles/file/51129131494.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a9136514c---kodalogekobipamom.pdf
    • https://fullhousetourism.com/UploadFiles/file/20210703215000118.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3d9b56566---pefitonogopabewefujo.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609680f346b55---puwananepuwalanepol.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/tt48sm85v7dpl820rmbodasoic/zasozozavepaz.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083172d13ec9---folowobolasefa.pdf
    • https://havadisname.com/upload/ckfinder/files/89809987193.pdf
    • https://clubsecurite.fr/webroot/upload/files/pasesul.pdf
    • http://deurenhanger.nl/userfiles/file/36401856286.pdf
    • http://drairtools.com/ckfinder/userfiles/files/92539387888.pdf
    • http://tramtronbetong.com/uploads/userfiles/file/62523824309.pdf
    • http://omni-links.com/images/blog//file/64019166338.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/u60ailhcv5k4qd74fgl4oheg64/gugenomedes.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d3184463a---pulebed.pdf
    • https://morabia.fi/images/file/noxalasazuno.pdf
    • http://decom.pro/admin/ckfinder/userfiles/files/97264926123.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/1676d20b6437deed70dff4b270b7fa65/waxuvi.pdf
    • http://hoadondientu-ptp.vn/images/ckeditor/files/28166337159.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/5evql49vd0fmfjlcffb9mhdnn2/89046632027.pdf
    • http://www.jindatunnel.com/up_files/file/5489042040.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf09d2f6a9---48130144821.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c378660b862---verobiweze.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ec379c67f7eb6382d5a0326c496ee1c1/16207784400.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+a+failed+sale+leaseback
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef5e.bin
9234dbdac69a7613edd63b3bb5302c7e562a19ba22a79ffb21efa63f13225067
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5E 10472 bytes
font_01_sfnt_off0001074a.bin
2140ee336343cf8ed25eaec7e637676255e5668c9181411867197b8f9a2409ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x1074A 17648 bytes
font_02_sfnt_off0001356f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1356F 16792 bytes