Malicious PDF — malware analysis report

Static analysis result for SHA-256 803efae7a10ac351…

MALICIOUS

PDF

87.0 KB Created: 2021-08-10 01:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e13ea5dc658127cd6ba9d1109217a47d SHA-1: 141aaf247f67e40887e802d58142eeaa27555393 SHA-256: 803efae7a10ac351cd08e0c2d1236519e38b43ee8958d8126a3ca1c500946139
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://inwebjor.ru/uplcv?utm_term=proyeccion+caballero+dibujo+tecnico PDF link annotation
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad303bcb8e4---78563435760.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/76401059448.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/kekamo.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095cd4042a78---nidivabawekenewi.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/kesetaxufozuninikuvaped.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/mirusejenozadeselu.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/11166900979.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c29f64bd318---1109507340.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160abba70d3bfe---kotidurugasiwozubibopejaz.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/naserulo.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/45341633228.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/mojidojobu.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/353ca50c474dc4a1a18bbe2509e1d477/fabolep.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/zexiwomegufi.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/1b8afb56536bd4ecaf43fa52963c3656/75849875117.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57a6ad0f74---nifuzavujazezomawikaxix.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/29860886034.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/kl5cngrevd2n52tk2buedsn653/9657905616.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/dagesivezozal.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108d7b27938c---xotakivi.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2d748c9ef320f392d7cefc18bf72db6/wumad.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_off0000eeb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C7 17596 bytes
SHA-256: 0024c9c8563845b48e791d034a09ab0f73127cf5f726216f7dfa9410f4dd9dda
font_02_sfnt_off000133e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E9 10680 bytes
SHA-256: 0137ddae39a71b46917b6d5f891e0f8dfd07c4d6cf5847f5b5a6803a953debfe