Malicious PDF — malware analysis report

Static analysis result for SHA-256 81517df93b50873d…

MALICIOUS

PDF

80.4 KB Created: 2021-09-15 20:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c2d41a0b75a93c0cec85e0d5b783208c SHA-1: 38f65ca53c8ca3edb70a0a37166c06a849c19ba7 SHA-256: 81517df93b50873d427e651223579a1422a16ce51f3ed89ff8039eb01f844ce7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to numerous URLs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://aftckwt.com/uploads/file/padoxadigizurawutikasik.pdf In PDF document text
    • http://efrex.cz/files/file/40785516135.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/boxulaviveb.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/50116322078.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/30609910036.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/33159348874.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210911_070907.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132655c914b1---37697981000.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210907215137.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/64524579424.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/1689240075613d05250baab.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/lanoninobonoxomuxaw.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/31350468876.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/3rd3sld9v57resdtb82ecde2d1/38225005740.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134d822989b8---loxilulifod.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec06b381af---68158692609.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/18141106295.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-2/20210902040737488531.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/15387156479.pdfIn PDF document text
    • http://erex.hu/upload/file/57206560243.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/20836440688.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/vadepikorejivorux.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5b2706fe7---21098076337.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ccf952a388c2d25b6a12c3cfd3df3614/sakifabunefer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+transfer+pictures+from+phone+storage+to+sd+cardPDF link annotation
    • 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_off0000d69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69B 16540 bytes
SHA-256: ce0270478d0a0a9814186baac825254e4206cccd01b2dc89cd22b762b9580c0f
font_01_sfnt_off000101ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C5 11200 bytes
SHA-256: 5ef1b0f9723503e926fa045188aca7a7ea156421e34d5e9237ac57ef10ee3290

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