Malicious PDF — malware analysis report

Static analysis result for SHA-256 855fd6d0cff7e07f…

MALICIOUS

PDF

87.8 KB Created: 2021-07-08 05:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4e5de564033bf923aa8b1d9cd12858f3 SHA-1: c284c29e00ffe35093ef1e166dd03a259f43a28e SHA-256: 855fd6d0cff7e07ff36516c6ea27c4c412b39dc4348d3dbefbe2b3fa6710a6a8
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://cructi.ru/uplcv?utm_term=parkinson%27s+and+urinary+incontinence PDF link annotation
    • http://ahcxdq.com/uploads/file/042244144478.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/987503b281338e8f3869ad6d324ef45d/38598083141.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/7fda3a7ae0874483fad6ba4a002d23e5/mozutilufosepanagidag.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/a7fd96921df0e28ed10ca14d2a865d85/jejujuxo.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/58379538251.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/dutobunabamaweze.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079438b67156---jezaranasudafibobivosa.pdfIn PDF document text
    • http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/46251680472.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/gamufuvesuku.pdfIn PDF document text
    • https://argumentua.com/i/file/84994575462.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/123984f00049ee7c44dbe9d9a44e6991/rotugetikisulunedil.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/0u11mf5o3hdp63n0e1o4mqk10o/91052237999.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d844ee7e4---39898143621.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd21f58959---14652107726.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160705fe2b5e8e---14865583168.pdfIn PDF document text
    • http://kingnature.ru/files/files/molixaka.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/meromuvugoj.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/22546723360.pdfIn PDF document text
    • http://bamila.vn/luutru/files/gufej.pdfIn PDF document text
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/13368687692.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d962192636811a2e83942d1e8683a5c4/zolakusofimamebaji.pdfIn PDF document text
    • http://lhs1965.com/clients/880801/File/gexukegezorafo.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/d5ebf6d3cffaa0a41a48158962c677ae/mudakonewisifofajop.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_off0000f624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF624 10656 bytes
SHA-256: 339268b748759dd7ad3f57e0b7c495561fc9cd43fec628154911d0793205f803
font_01_sfnt_off00010ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DE 16620 bytes
SHA-256: 79fc744f8ce3b35c7107fd6fd5c3fd75fd461a3389f8db60802b0338ee21b466

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