Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5ce9dd0d580264…

MALICIOUS

PDF

74.5 KB Created: 2021-09-08 11:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1353b3b6a52b57b67e418602e2d4398b SHA-1: e7e66616c58dbf5595853837c73c195408201bf6 SHA-256: 8b5ce9dd0d580264b85d367c448ab44a277dabf30922852bed386cc7a4300760
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of ML and ClamAV detections, along with heuristics indicating a link farm on disposable hosting, strongly supports this. No scripts were extracted, but the overall structure points to a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=john+scofield+cissy+strut+pdf PDF link annotation
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084a30f1f75e---jagodozilavamebeneta.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/32877979466.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/beboribukezopekaru.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/rh3dmjjq1sopmhgmaovi3roma1/36609744582.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce00565ffd4---setuxumaru.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b22d48390a6---41628333767.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/vijexedipafidopuzigar.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/kofixolupuporugobejumum.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d3e60fa72---72733593569.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/waduxi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d52d2b4112---88267852691.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/2mk8o1o5dsa97m3mgoo65jmenn/25508415000.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/tolamaliwukeguripimimo.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816c870f54f---xekoxupexe.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf130cde67---24926029075.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/81121882649.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/43739969561.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0507dd974---pefixanadamixizofitatuto.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/8621190523.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e29d724d61a---fomeki.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-07-16/images/files/jomewikiwitofesemuvup.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd2f0290b41---mikanu.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/4654118554.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/57016221657.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_off0000beb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB2 10760 bytes
SHA-256: 62da4b28876024a8af0fea79976b835c91367f933617b6f3a2bfa1ef9199c968
font_01_sfnt_off0000d771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD771 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 17144 bytes
SHA-256: e79e2000622de717e99cebaba30366b6728c16ec9b5d9004c8d086f29d0d2070

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