Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c620a376b72e9e…

MALICIOUS

PDF

76.3 KB Created: 2021-09-05 01:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: daa0399100ea8bcd06e17da7ce3f7dee SHA-1: 9790bd52091d0c37f4d42b7a7b18659d09d22efd SHA-256: 78c620a376b72e9e95d466194bd8b7d841af3beb408853760b0eef42707e171b
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=learn+astrology+in+tamil+pdf+free+download PDF link annotation
    • http://grafichesirio.com/userfiles/files/vepezojupode.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/12949272608.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/22387876942.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/14930295827.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/62341519473.pdfIn PDF document text
    • http://dothanhigh1970.com/clients/6/63/63ba8bdc6fdca46b25bb56d5732eafc9/File/lopakuwomilutijebevapi.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/hhrc4rm56j74cuueic9j9kj98h/pizuki.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/43kb5v0v9avo5r3nvcspk10tk2/57662664267.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/e30d2db2ccf7954c4819de0eaced84c9/90106772148.pdfIn PDF document text
    • http://119pump.net/d/files/21946484132.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/wozopotobizakuv.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907c8b3e9af---7752014703.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/setosuda.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/bamasezakofajunajekafizup.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/mva1b8ljfvhsdiko3otqp4p65b/devita.pdfIn PDF document text
    • https://wsbtitan.com/images/file/degalifubet.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/49042d85b4920f6acfa9ae179024ba51/42741160435.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/13880039213.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/nobel.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/71c535c3d4391807315db2e3868df981/35018467871.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/sobifotiponarosewek.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_off0000c490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC490 10996 bytes
SHA-256: 9d5d15a528a103f8f00f7d1d4dff90476127cf4a061bb12404eba48825dfba8a
font_01_sfnt_off0000ddef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEF 17756 bytes
SHA-256: fcd16d7a9dc319b5114ee6576814114d61fa5615200c33009807a6cfecfe3ebd
font_02_sfnt_off00010bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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