Malicious PDF — malware analysis report

Static analysis result for SHA-256 a275bc0c708367e8…

MALICIOUS

PDF

85.9 KB Created: 2021-09-03 08:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bdf2ddea6c9daec2f74eddd93b34db28 SHA-1: 018309fe2c4b0a132054077e7a59f79ada95f9d8 SHA-256: a275bc0c708367e809692c7bed2f877c86678849dbf570310a2240412e8979ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to phishing or malware distribution sites. The presence of embedded URLs and the nature of the link farm indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nomylo.ru/uplcv?utm_term=blackweb+wireless+bluetooth+earbuds+manual PDF link annotation
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2efd23e06d---wexafalevim.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/370f1fdbb035c33fc5aa245ed05b5b86/11666084834.pdfIn PDF document text
    • https://melz-feu.ru/upload/46591557243.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/32418466311.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/pejoputupizaj.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/41082810330.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/1422066673.pdfIn PDF document text
    • https://robertbah.si/files/file/65988811506.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/lidus.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/72193503101.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/67424457893.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/tavefud.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/28643868096.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/940352da39864a45d4c2325f6c151508/56152557403.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/200753907d1e3e55328387c2a9d472da/viwokejediwuzu.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/tegowux.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/palipozumezetimuvuna.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/29243757973.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaffbddf3b---22723230718.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/23225089938.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c495340b6---56700736135.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/loworu.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_off0000e8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E3 18260 bytes
SHA-256: 4b34ffc5d467588d10a15d5a1a48f844b1e480bb5112935dab0bac006159288e
font_01_sfnt_off000117da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DA 11108 bytes
SHA-256: 985e8a8bca5ad5c4344cf28050a87b83ddc623eb295725e9142ac0e7218e4847
font_02_sfnt_off000131ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1