Malicious PDF — malware analysis report

Static analysis result for SHA-256 303c9e363f3d909a…

MALICIOUS

PDF

87.5 KB Created: 2021-08-26 00:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3318fe6e0616252c9f26b64812002012 SHA-1: 013533a18d2a1e75363cf05277c400355cbc3b3f SHA-256: 303c9e363f3d909ad80f2a663fead1e4e485a75aafcb4bd53dc40ad632a5e66a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://smidgel.ru/uplcv?utm_term=last+year+grand+am+was+made PDF link annotation
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5b128af3d8e0928e2c58d2769604c557/rasufufotuveponafax.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/f874378390a0d8c8862e4945b35b4632/xifimeke.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/pulogivaginus.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-16/20210516202138395420.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ecb4bffbf---bilejupet.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/mffirh9b60nedjg458k3miv05a/zususo.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021051208042573499.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/43238400633.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/sewukewum.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/31762896577.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/keraneneforojowuxev.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/b855319136206a2bd343b24af7f7d71d/19894688982.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/gusegirifalixopavabem.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/wipojowowejobevimo.pdfIn PDF document text
    • http://canvangdientu.com/images/file/tuliwetufasega.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/lerijur.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6fc3ae01e---retuwekewog.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/bedukawowofapitebutonamu.pdfIn PDF document text
    • http://kotolantopeni.cz/file/35215271064.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/83235107701.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/4634807479.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af9640251cd---35030620468.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_off0000f338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 10492 bytes
SHA-256: c3a0cd38bd6e7d11caf346e1f708039cb398f73bd2c96382581fbd7e37317dac
font_01_sfnt_off00010aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEA 17348 bytes
SHA-256: 528a815ed4ae55c0fee331d00e80cc6af6ca59af35b75ed6aef4a01fd1712353
font_02_sfnt_off000137f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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