Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7c2cf8e45e6676…

MALICIOUS

PDF

92.3 KB Created: 2021-07-21 06:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b44fb66a3ebbb72735f5a684aa8d84f2 SHA-1: 2f5af65cfcb3ed43a411be4984cbedc9e66aa6c4 SHA-256: 4f7c2cf8e45e6676736d614b9e77d1b1086d1f86b006c47bf4d17671c7300313
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608135dc89b48---35551372226.pdf In PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/fuxobinu.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/79414589321.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/3887235365a72031f015add542a60d24/xugewuxemeberonusunusavo.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/e7rcfb4jqol0ne82cv16baf924/rafojigadejab.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/90918205097.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/sikavokatez.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/7397250908.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160774a6e3d246---55381575696.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/guponofejuwason.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/70551042766.pdfIn PDF document text
    • http://cichanski.com/Upload/file/54920112499.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/b4ccb6de2a9ff2504c43ce26220a36ad/lufujo.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210713075335615.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/63fad5f7b5f1ab101bab35f3d2565034/9107193664.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22831678603.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/35569983654.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7296b8f22f---fuvatitegerefibisav.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083acdd3124d---29146915190.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/32542a76b7861488850ea2aac49eaf6f/vigenosovovegefipija.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/4823038af335738a01c358e99a0de89c/79408554966.pdfIn PDF document text
    • http://famillespourstarlight.org/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/faguba.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/59912803735.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/503aaec8c051be3fa1ab3c3aa084f4f2/34131487425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=spanish+motivational+quotesPDF link annotation
    • 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_off000103ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 10804 bytes
SHA-256: 43927354afcad44ac9819c8520d20f4a937e2752e40ff84f24462686f0c32ea5
font_01_sfnt_off00011ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA0 17616 bytes
SHA-256: 15e740986c6a93420d39cf8af88ea6c49da96ab2d6e9ce4db3a2660372e2de2e
font_02_sfnt_off00014a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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