Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd879f6b1e0bf42…

MALICIOUS

PDF

77.9 KB Created: 2021-09-02 09:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 12726492a8a9bf7037de7cfb9ed732fe SHA-1: 1cd09129e57078aeca7683ac608bba1d2b47add6 SHA-256: 1cd879f6b1e0bf42a3196d34ac91098fecf8a1cef70a43134a65c3a8af30945d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://archism.ru/uplcv?utm_term=costing+by+t+lucey+pdf PDF link annotation
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/gukufabozifujuxudipujodiv.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609315361a5ef---83660880328.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/detexuti.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/70076336207.pdfIn PDF document text
    • https://gilbertems.com/videos/file/fanigotirefinubumonini.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/teforovaxaluwububix.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/34709228173.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/439d953e36f7cdc0df7f71b408e035e9/susesepinuwowakuxovizo.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/30313436313.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/taxipagizovimab.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/89453908329.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/8301939906.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/bp9vgm39k2nopk2gsft380p9nj/11229774220.pdfIn PDF document text
    • https://vieclamkinhdoanh247.com/upload/files/2057902547.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f4412d101---16728140093.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/wowoj.pdfIn PDF document text
    • http://jaht.com/userfiles/file/77317498627.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/3d193df11378a9b62e6f5d1d4113a388/dukobiwuromozezagex.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/goxexaxuwilutepiwatapid.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/e85298c75cea9722473716da7c8a4c5a/tekepekukosebidorelewer.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/ganubiparigosi.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/rulibagewowex.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_off0000cd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE530 10920 bytes
SHA-256: 280a5170f15ddaf5dc86a8493f100b5ca9a6e224697f0c3066be577c3d376b71
font_02_sfnt_off0000fe3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3D 16716 bytes
SHA-256: 3d7ee31b462c5f5c9e66a40fb62730494c15c2d516890870e07c9cc35f2726da

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