Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b79c88c7d9a8946…

MALICIOUS

PDF

79.6 KB Created: 2021-09-04 06:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7abd583ccba5a1a22a0981c9a26f7759 SHA-1: 4a90cbf49de62f0c5ad988499e06cad31bae0193 SHA-256: 6b79c88c7d9a8946090cdd77567e45f35256c69804b9909f9296070c7166c4d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the download and execution of a second-stage payload from one of the provided URLs, which are presented as a link farm to obscure the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://combatkuntao.com/ckeditor/ckfinder/userfiles/files/zulikugadipi.pdf In PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/laguxotija.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdb7f0f73f---movodezutokapod.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075cdacadef9---didikokusuzabavav.pdfIn PDF document text
    • https://podimercrm.com/img/files/88986354657.pdfIn PDF document text
    • http://simonide.org/userfiles/file/90163417698.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0c99a0ed4---gomabibutemoroti.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7a80c8ec1---xoxanigelet.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16129a549d87e5---dozofaletuvotojavivivi.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210817022018.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0c6eb4375---gutuxatakak.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/q9t6fnp9nfee04ptiecer4asop/tumidagufaledevi.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3d54724a9---lafaxesi.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/jomapolerowolukuk.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/wivifumozepukunikoja.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/gexubelumozukapakupimat.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/fulezegazarelej.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8814f29bb7---wuwegutebabinixoratolo.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/73620739812.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210822_D7757464A807914D.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=deities+and+demigods+pdf+1st+editionPDF 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_off0000d0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B3 10748 bytes
SHA-256: a8b259ae7a91519611c888bb67e9e49a2a100badba4218dbd4f1c42123983662
font_01_sfnt_off0000e948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001015a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015A 18348 bytes
SHA-256: 45e9f71af10d1a9c2393de21b05bf79bee8d794f843350ddee33830d815b71f4

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