Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df8d147c73c910f…

MALICIOUS

PDF

72.7 KB Created: 2021-10-04 13:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8b84191c5b1b68d4a6dabe66e995cddb SHA-1: 48447e71c9532d09138ec69f81d5cdad254a2f20 SHA-256: 3df8d147c73c910f68f6c6816e5fd275deba4ed0e9beda0fb4e7a6397407ef44
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites that appear to be part of a link farm, with some hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=real+time+physics+module+3+answers PDF link annotation
    • http://twinmd.ru/userfiles/file/13047367682.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/47783703281.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/xigiwewegomagegasofukokuf.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/soduwetipupiwudu.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a4e94c08a5---delefodazemumisuxibevu.pdfIn PDF document text
    • http://wixoon.hu/upload/file/belar.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/kazonekedejusafuwol.pdfIn PDF document text
    • http://allycatering.com/userfiles/tejimidofu.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/4879af2ae726b3a4bd898ec6592ac8e9/rugozitutodug.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615333e42cf84---67856677714.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/9443639272.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/vamujavotonaj.pdfIn PDF document text
    • https://lordoptika.hu/files/files/lagimona.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///70162388309.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/33531306080.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/17641549011.pdfIn PDF document text
    • http://mfcpavpos.ru/file/52944472536.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/mogowes.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/53177993234.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/73445416210.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/29415384762.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/gufususa.pdfIn PDF document text
    • http://upakuika.com/img/file/biresasaw.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_off0000b505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB505 17736 bytes
SHA-256: 50f474adc744fdd3f1bf72651f86699ffaacc5b2b05d7f35947b0d5c82c043f7
font_01_sfnt_off0000e2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C5 11296 bytes
SHA-256: e52e7608e4858b84da82b7fa600c80274a2742c82437e841fde477a21fe86b89
font_02_sfnt_off0000fd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1