Malicious PDF — malware analysis report

Static analysis result for SHA-256 db23b4c55b309305…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 01:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e6349ed603dd43fb670773dce8762def SHA-1: 2083477434ba106ec8a143a71d7ff172c3f657a8 SHA-256: db23b4c55b309305aaf7d0318dd726b06fe8b5b25d71a5a4be33d5f5ea8f617a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various URLs, many hosted on compromised WordPress sites, under the guise of economic data. The presence of embedded URIs and the nature of the links suggest a phishing or malware distribution scheme, likely initiated via spearphishing. No scripts were extracted, but the PDF structure itself is exploited for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://catamma.ru/uplcv?utm_term=difference+between+real+gdp+and+potential+gdp+pdf PDF link annotation
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087df30c1cc1---zazovarademafoparo.pdfIn PDF document text
    • http://4bx.pl/public/file/noxedudulimupesadivubom.pdfIn PDF document text
    • http://iwishop.hu/file/61420556755.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607223c083517---saxotumezetabipulezotejeg.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/12664008199.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/tiwabisenalixexon.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/895a49480d66d290cbd6a9d3b135096d/47584295464.pdfIn PDF document text
    • https://bunianco.com/other_files/File/9253884277.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3051c0da58---14885597920.pdfIn PDF document text
    • http://land89.com/ckupload/files/pefiwebidifijonixugi.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160913cabbe570---fatizenamelodokoxikaxux.pdfIn PDF document text
    • https://orangerun.re/photo/files/22087815692.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/5464e20a90f676644515d3807fb19667/44396666606.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/40037880987.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/37d8359e1a51c71889994c98515a7781/74353594836.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/19429133455.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/96178017209.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/12695877576.pdfIn PDF document text
    • https://uudanbury.life/files/file/10616085794.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/8700820595.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/zesened.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ts7ur22vm9knnd2f7j8kvr05l1/nakejexewag.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b856b55815c---vopuvojopizel.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/dokatovoj.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_off0000d2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB00 10856 bytes
SHA-256: 6efb19a273ee7ad58257e7b3f7661cb4c9a0a772791e446b6f89b3f3381578b0
font_02_sfnt_off000103d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D1 19520 bytes
SHA-256: 519a0add5ec3cbc96e365bf024adef6591f568a62b3999eb7fda0a401f1ae9b9

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