Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee25c88d1077b250…

MALICIOUS

PDF

86.7 KB Created: 2021-08-12 14:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dccfced2fd6260178a66d71da7a9f21f SHA-1: 04b5ab0b9fc19f2a3bba68409c346df4a55870c8 SHA-256: ee25c88d1077b250065e6dbf3574e321214ae37068d53d79dcbc9ebc561a638c
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites hosting other PDF files. The presence of a link farm on disposable hosting and the use of UTM parameters suggest an attempt to manipulate search engine results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • 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://delve-cr.com/uploads/10079997531.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607722738a17b---xutazur.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9o3t1c29r4qlbrb84upuec3r53/mojuxalas.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/e47r7v51b8s84khnd7au7bv98g/93720682861.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5fb51a43d9b5237a77813abeb5ada842/81370467618.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b824f4f6c6---92499265046.pdf
    • https://inncredel.com/uploads/54251164159.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e4eb585ed---toxapemusijof.pdf
    • http://portalkucharski.pl/app/webroot/media/files/wosovitisesujisafe.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/5581153c941518572b01edf93bc27178/danutatader.pdf
    • http://aivieksteslaivas.lv/userfiles/file/44824583380.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755844128da---rapunus.pdf
    • http://lowdertraviscoats.com/clients/7/74/74ec8bd2877f4db8d0b9f56bae0111c3/File/gubojifadixadimiwes.pdf
    • http://circolonauticofavignana.it/userfiles/files/fagaxezafujekazixux.pdf
    • https://pilot-nav.com/ckfinder/userfiles/files/32529160253.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/fc736df030c94ae2562c0c2534726958/xasijatofexufemokixamow.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160742f168e6d4---jipidemanojati.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd1d5ec557---judoputureziritofo.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/28412305504.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/lqckeo74mo8dbipeaml0hr0kb0/11215891850.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f97d6918bd---69369702338.pdf
    • http://harrisonfamilyreunion.org/clients/868801/File/pesamafenenafe.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d3667b596a1712294a0fdcd289c3e43e/80214672637.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=battle+for+middle+earth+2+1.06+patch+notes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off0000ef15.bin
e3abbc52392f5adc9f499b77e4c8c8775427f475d1664b79923b2006c7d84c10
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 11464 bytes
font_01_sfnt_off00010a15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A15 16792 bytes
font_02_sfnt_off00012227.bin
493ef7623ad77be4332c90874d710a25ec5078d0ce2433f91499c40f8286f534
pdf-font-stream PDF embedded font (sfnt) at offset 0x12227 16524 bytes