Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e97d9fcb70dd66…

MALICIOUS

PDF

88.6 KB Created: 2021-07-01 09:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2fb0599646231153dd1c11f5fff7d93d SHA-1: 62c7620a12272b426f666324feac8f6d6a163e8f SHA-256: 98e97d9fcb70dd66fc6cbd813e5b1ed3c610c3d09822c16e366acab2e2daa04c
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple unknown URLs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/83f02c3237e61c7659d0191318612927/12317886645.pdf
    • https://mimpiindah168.com/contents//files/42250942148.pdf
    • http://sewakendragroup.com/userfiles/file/fatepimebipaguvakovonogo.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/pm787rj459oe4fei9ml0ku92k3/lifisipomuribemixuwozo.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080a757cfc4e---39871709706.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8f9ad8091---lajapaf.pdf
    • http://cuatudongsaigon.vn/uploads/files/zapotevebakunakexafo.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a332db83a2c---nokabuvivemipika.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/mrdojlcbn99618hpn1rqlemn6q/19031708410.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/b920718639889fe910e41843e31c1f6b/69845972297.pdf
    • https://sportsht.com/userfiles/file/75737710870.pdf
    • http://familycrawford.com/clients/3/31/31f1fdc6e90c562b7578e9c437f7c1bf/File/60537828704.pdf
    • http://xahscw.com/userfiles/file/kizijoxon.pdf
    • http://absolutelyneon.com/userfiles/file/tubetosuboma.pdf
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/33815713957.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c062bda5a38---89601684902.pdf
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/41616559500.pdf
    • http://grafichesirio.com/userfiles/files/85412510046.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36e1d97ef4---pudoxizapemepuxipi.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826f21862b2---32190116116.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f15c8c796d---nizesew.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0f9513199---40311680662.pdf
    • https://mygo.com/ckfinder/userfiles/files/sofogepoberigopelabe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=is+ok+for+my+dog+to+eat+grass
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fc6512561---suminurej.pdf
    • 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_off0000f7af.bin
69e3722e94ccc39306783226ccd348cfa3ad9688add0efddd10d447f2e0fb858
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AF 17248 bytes
font_01_sfnt_off000124e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124E5 16792 bytes
font_02_sfnt_off00013cfc.bin
066c9de99e4199a49ed8f0f433db4220b65ff8d238c1f23a8c96ed1bbacd736e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFC 10612 bytes