Malicious PDF — malware analysis report

Static analysis result for SHA-256 408a15f6a7d827de…

MALICIOUS

PDF

78.4 KB Created: 2021-09-19 04:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a295b60648add905eba32ba63cb36fe SHA-1: 85af72b732a24ecfa4f96157d9e4cae800dc18ef SHA-256: 408a15f6a7d827de04b357ce094fc23e00778c2cf4e89e63224b3fb389e4ccba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The embedded URLs suggest a multi-stage attack where the initial PDF serves as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=throne+of+glass+book+4+pdf PDF link annotation
    • https://szallas-karpatalja.net/upload/12495300708.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/61152921389.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/53822889518.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/81245594688.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/12916851116.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/07f9d655fd3b29432febd742c8346b9d/54936716123.pdfIn PDF document text
    • https://rotitelor.com/contents/files/rujutixadikebanasanijok.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/39436539487.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/63118165066.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/zojopudexo.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/27aontalqmt2utnl1c7ee5gh26/93307703510.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/zedujavakinu.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/fuwafozopezakenuxoj.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613a76b004c5e.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/likizukutabuterowisit.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/tumadulitonip.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109161420349698.pdfIn PDF document text
    • http://anpharma.net/upload/files/luvutitonojifepunagi.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/mulejixonopelomigabu.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351c6cdb0cb---81942270986.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16143f80051b01---41391305696.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/54681317481.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/tapekif.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614670a07e8c8---sasunevojisajimubi.pdfIn PDF document text
    • http://webs123.com/userfiles/file/68472443080.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_off0000ce9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9D 17208 bytes
SHA-256: d03cf3cdd871bd259bb5a934c7fae28c5e8419af240865367023f5ecba3d5673
font_01_sfnt_off0000faec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEC 10860 bytes
SHA-256: d14f23a28dac8cf5f0a83e1e6138d6e774f84616addae9173304b3980cbe8284
font_02_sfnt_off00011387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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