Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cfc9b82f38b1e92…

MALICIOUS

PDF

83.1 KB Created: 2021-06-30 03:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c0290f124ffe47f2ff4212b4637a2f5b SHA-1: eb8c4f1bc7acd55c6bfb67e484fbe27298abd37e SHA-256: 5cfc9b82f38b1e92a52881f111e4167730d2a7086e67ca1d004edf7e523ff8a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS uploads, suggesting a link farm designed to redirect users to malicious or phishing sites. While no scripts were explicitly extracted, the nature of the link farm and the detection names imply a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ketchas.ru/uplcv?utm_term=how+to+become+an+interpreter+for+the+deaf PDF link annotation
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945f6d91915---10089724247.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/ccf1bc6759b4582b7804454622261f4f/19190154928.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a799d0727b---2882071744.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45fb25caa5---jefodolenur.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/6998883703.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b706c3aa38---berima.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ee422fd950168bdae24e62f581d25743/wodilipogufo.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb4d771ea7---borikoruwizajumef.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/7fbdc8163e54ef110bb265753d6697b5/48773004476.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/p7rj972hgkneo22aqi2sfu9erd/19816100330.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/faperesutuwurafuz.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/vapavopuvudilizefopo.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ccv6rjevoq71j7tbth36nf5bao/mimimelizubimofopume.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/588233b0f62c9004089ed383b9c27db4/peroso.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/43209080969.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/jutf9iq9psf0elu5e9gb3s5e74/kipizisi.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607009808fb12---24910726225.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0e52733b4---mutajepasaba.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/33aae52c683463885f658c3d1bf9a0ea/pisududiwanuzuzosugefejo.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_off0000e290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE290 10888 bytes
SHA-256: 6ecfd701961ce2fa2ead69314f97b0fbd2ef2623b4fc7d9491769fcc2cbede34
font_01_sfnt_off0000fb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001136a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136A 16992 bytes
SHA-256: 5200be809be1454e655e6f70135d7c3078547581f935d34320ef050e8f32f5df

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