Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80f5889f0b63612…

MALICIOUS

PDF

72.7 KB Created: 2021-07-01 23:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8e8ff4da2e177390f99e96559cb329de SHA-1: bbdc0b15a45d019ac0de280b3d98cd03fa7149e7 SHA-256: d80f5889f0b636123d55919451e6901ccaf87518f0d0b13eaa18e9a15ae4117f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm or phishing lure. The primary purpose appears to be directing users to external malicious sites, potentially for further exploitation or credential harvesting.

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://archism.ru/uplcv?utm_term=annabelle+comes+home+full+movie+123movies PDF link annotation
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01bb0a48e8---43897085126.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/a38r78cnosq21nuupikul9pt67/42531072748.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/nejefitaxedavaf.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090d851ce836---59913715347.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/82864358808.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/99759042901.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/79592716015.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a131b2ca9---xuwebisewuloba.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/kinawevutadesofilupimebi.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/83426514637.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6e574bf36---22000556015.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a43e7c8bfd---finuxukupunarejodegujo.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/bikuloxapabonazire.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/59341688298.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/117e130284adece56417ea6127b41573/mabonerebu.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/10229398399.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/fli6fs9bjt5ojk38buqhod2fr1/30072151633.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c060980e5a2---kipoleruka.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608840758dfa0---nonemekozezemotaborolulis.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/61vup49n28t794nkhvb22avvvh/pawixikogov.pdfIn PDF document text
    • https://citytrafik.nu/images/file/54640287668.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/10356722281.pdfIn PDF document text
    • https://baongochoa.com/upload/file/zixosesujuvajejalasunax.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/f6iuqt57l0mescv5bj3fc7o94p/gopimemururadomadiju.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_off0000b93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB93E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD150 16652 bytes
SHA-256: b2a3560cefb24e790f9319e122c74f962f6c1cc58955ead196f22d79a90463b7
font_02_sfnt_off0000fb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8F 11036 bytes
SHA-256: f4abe44dacdbac36c343a48422c7d547cab66e76e40ad30c9fb7526c9c2e63f7

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