Malicious PDF — malware analysis report

Static analysis result for SHA-256 120ffd79c75014f4…

MALICIOUS

PDF

70.7 KB Created: 2021-09-08 09:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c36ad3dbb020e3b8f5e060c5e961ffd0 SHA-1: 6b3cf21588c14d0cbc4b4334a607bbac7a97dfa8 SHA-256: 120ffd79c75014f4edfbdf0e8a51cf884feb8a360b1d9c8fa23394f238581eca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains a large number of external URIs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://huntic.ru/uplcv?utm_term=pictograph+worksheets+for+class+6 PDF link annotation
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a160ba8f---tipewowuzepekulukaxamonoz.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/mewedamowixe.pdfIn PDF document text
    • http://st03.it/userfiles/files/84414896159.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e6a7840bf214a8a4b15873126e9f002d/zufajirefoxe.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/lnc59buouand6h8b0rfspgosq3/domimarisafox.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/53954922647.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/porujixosedabunefoli.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/2326259294.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf56c9dcf7---ziwixawebewukosadesukuvip.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4b0737862---kujapimebitozuwoko.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81853db9bf---50128515921.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/63775216114.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/61018b051307919f93e2957015df2d69/dolitewofurikonibeg.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f20d7b4340---23541896518.pdfIn PDF document text
    • http://z500.si/files/penidonemili.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/xuxoduzudagezijuxuj.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16083a31d3d394---rebinode.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/vufazujewevopixik.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9815dd74a---tebetijabuwekujim.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/4a1a1700b35f4c085ca18cd5a7562759/96561320007.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/kofobejava.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/e3ssl1gabovhqth874bnhjf9ap/vorisapomulum.pdfIn PDF document text
    • http://seamacros.com/upload/file/xusizanagikexig.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/12321587578.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/84179996518.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C9 11000 bytes
SHA-256: 3ada3b339ce093aefa856c31720d6915bd64ba405e385a4c7f670842964f0808
font_01_sfnt_off0000d09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AD 14948 bytes
SHA-256: 1c5f9f84cd3d4ea2f837dc7eeb303d7d42eb366e6469d58d7d9eaf6646347489

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