Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9a0530c18331dc…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 22:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d225e694d263a5ac8dca6aec522431d9 SHA-1: ddc0bf9b2c2f810cbca866f123897846a181675f SHA-256: 7b9a0530c18331dcc288fb42cd070a1a316a6b9ed055527f710eefa4e51ac4b3
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of a 'download' button lure further supports this, aiming to trick users into interacting with malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://espiber.cl/images/uploadedimages/file/sufipogadofejizebefivanu.pdf In PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e6f63de12---zabitovokelarojo.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/mupuzupojodutat.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/39234256903.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161398643c45fb---29082426309.pdfIn PDF document text
    • http://stromzeleny.cz/file/fopazoleje.pdfIn PDF document text
    • http://4bx.pl/public/file/fafagurixekanizejara.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/62556918905.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/6958343520.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/34881660095.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/goteberijix.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/vikumutimimusepa.pdfIn PDF document text
    • http://analhospital.net/file/files/gikew.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/54970845773.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4j9ejussn16j2pps8ka6prhj17/vubudugawedavesunul.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090316533673.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/14519503310.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/612fcb4ead1b1.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/vazatogamefa.pdfIn PDF document text
    • http://cx-gl.hu/images/files/lijavavebewazefefijoju.pdfIn PDF document text
    • https://projetovm.com/uploads/files/73578878723.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/jobitowijemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+do+i+hide+my+phone+number+on+androidPDF 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_off0000d8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 17944 bytes
SHA-256: b06ca2e3c957caa481f0551bbbd7b70edb6f435bd3e1764ba07198d6dd60ec54
font_02_sfnt_off00011fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC1 10776 bytes
SHA-256: d7881303fbfc20df1c49d321e96a385f3cf185ce3457623874fe4a300f587816

Open this report in the interactive analyzer, or submit your own file for analysis.