Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27a1720eff75ee6…

MALICIOUS

PDF

77.4 KB Created: 2021-09-03 15:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7b69e26c98e72fa8d787d009a4c33c73 SHA-1: 6bfc1aeccc9b0f5565e38c8bb9dff945e70d1842 SHA-256: d27a1720eff75ee63a46ade67e79428d42b22e24400ed5d6e0bfb75d714e5a78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains a link farm directing to compromised WordPress upload storage and other disposable hosting sites, likely intended for phishing or malware distribution. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://medvor.ru/uplcv?utm_term=everyday+spanish+phrases+pdf PDF link annotation
    • https://macroedunet.com/userfiles/file/jaxiwozolaridadunulodolo.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612951ebb3cc5---dakitatewuminuwesivor.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076508c9009f---vidalumeroteduti.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/gcrt9np35s6r5fo5nbh1rkcak6/15737489079.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/64840854236.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/c2202f9585e5ce3866b0e7f12ee53757/vogudifazefizilodiloda.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cabea48531---57273528624.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/pixejobepumabakivavu.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a6fff1b13346d953307b20495ca756c6/31565575797.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088263b1ee24---16919631511.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a465d3849---43398552128.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/98386218684.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/wuziveli.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/429463cf6c193890175323b022f2f0f6/sufokuwepinixumesog.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/063cd87883faf41b25e90a379c34980d/vunuxatolugazeweni.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/lokebisokotojod.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/214f287138c37b3e4c9a944f43330817/sipisasutavibex.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/fetukalu.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/87340090846.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/97448480481.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/munozimifimokanetif.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/ladovovur.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_off0000cd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE561 16920 bytes
SHA-256: 4d353323f957c89f055c62f9020152e26efd5e7c0d7f0deda3f842311935af71
font_02_sfnt_off000110d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D0 10492 bytes
SHA-256: 3449e49c4ebce60ae722edb8ae8be537600473379d152c38d0be78e5af0a2f46

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