Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99380ef4e7bf873…

MALICIOUS

PDF

74.5 KB Created: 2021-06-15 09:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54c43e1faa3a03b675123561b09b0b63 SHA-1: a1d3472bb9d286c1889c88df3acc209bae7e0652 SHA-256: e99380ef4e7bf873391d1f442bb11e9f1ff28c8b12432a719129286b12def500
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, pointing to compromised WordPress sites and other domains, likely intended to redirect users to phishing or malware download pages. The presence of these links and the overall structure suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 https://smidgel.ru/uplcv?utm_term=2+kids+on+sandbox+video
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec7b28fdc5---23912208291.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/2967731a52db7281120aa9db781a1392/39456260638.pdf
    • https://tonitomov.com/picture/file/99915238665.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9d7a1592b---9672196309.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8d52475f8---kamobelevo.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b151401c195---16863673020.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/ol47i7vdli52teb1rujgpqbf21/gakataxajilifiv.pdf
    • http://fszhenjia.com/upfolder/e/files/20210612002818.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/96b24d8987ad5eb7815f49cd8828754e/36222025937.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2s73ffah3sbiqnvn29galiou5/zawuxasilepamuzanixi.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4700354c8---67705710637.pdf
    • http://mrbossamktown.com/uploads/files/gogigix.pdf
    • http://brandnewgoods.net/userfiles/file/gupusal.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e48ed07432---46622381115.pdf
    • https://mobilieroccasion.fr/uploads/file/wulabidupaw.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160aac0add5325---sefedagorifetisabawom.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160abcfecf0949---85930729608.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e882.bin
1b82213fd2d6fe18b5b426e75ae5c5987c155dde88eb8e9a0b2dbd5a9d390c5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE882 5060 bytes
font_01_sfnt_off0000f9cf.bin
20ec516bd8f039fa8b2cdf767846eb4bb0f9484d9b6fa10c73f898c0f5033e15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CF 10404 bytes

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