Malicious PDF — malware analysis report

Static analysis result for SHA-256 7093ffb3d6cf1510…

MALICIOUS

PDF

68.7 KB Created: 2021-09-27 09:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec3b1178228479d72026cca987ecf32c SHA-1: 6eba58fd02034c7160a060d9c4fe3ae8522671a9 SHA-256: 7093ffb3d6cf1510f66d12a9a6a3ec5d95b4883e653684441e0ccdb820bd65d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF containing a large number of embedded URLs, many of which point to compromised websites or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically highlights the use of compromised WordPress sites for hosting links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://arte-salon.ru/upload_picture/kofudunu.pdf In PDF document text
    • http://holzbau-napetschnig.at/26709123716.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/21564283645.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/48590497543.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2109e94da27e49d49debf4c84739027a/17030524385.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/56713689684.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/81a7a6e625b580544f71d033ec25f5be/77670342341.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/zotulimaruverolalo.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e68cd3c528---julonevubusixexunuxali.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/togemirupaketovofepavufed.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/53456880326.pdfIn PDF document text
    • https://spyboarcams.com/files/tudetipuxemololenesog.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/derawid.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/molukirevumodidigirirol.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/mokizimuz.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161347dcd3f551---50332753641.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/dusowokebiwomibu.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/54066626358.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/ce19e4cf8694e93995531975d85c8852/45515659958.pdfIn PDF document text
    • http://lachina.cn/upload/file/43803653228.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/kubibe.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/vitogifad.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/82582565029.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/golaxosajodekiladut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=basic+open+chords+guitarPDF 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_off0000aea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA6 14876 bytes
SHA-256: 7855cb35c3bb52ef3207d1a34bc9508ffd4d8730002766d56b6e84cda3273d0b
font_01_sfnt_off0000d460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD460 10900 bytes
SHA-256: 2a3e6622601f17ed9212fa78cd620a701a1930904a345983d119786b11ae5c6c
font_02_sfnt_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1