Malicious PDF — malware analysis report

Static analysis result for SHA-256 45197d646a878a9d…

MALICIOUS

PDF

68.7 KB Created: 2021-09-27 06:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b9011e793d6fa1b2fe9131a461e05dd4 SHA-1: 7739153507812bc3424ed4cb6f8542bfc2c2e55b SHA-256: 45197d646a878a9deb63e8af1d63861e67c39526a1723f6702be9bc51bacb52a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly indicates an attempt to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1010b1dfb---finozifulilofikabewizi.pdf In PDF document text
    • http://vkts.se/userfiles/file/nefavejuwigokefume.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/watatebavekobazurup.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/56391942575.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/337bc93924116390f95c4feda26eb3bb/fomirewaliviwuf.pdfIn PDF document text
    • https://pecsikult.hu/files/file/wanos.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/72244391191.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/nolagazowubunudaxukekem.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16148cb255c559---taloroxolununajir.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/26196444517.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/65964853385.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/28480998661.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/xujuboloko.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/55455254297.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144dc8a35217---66499904774.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/2781997641.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/10326292075.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/29647231513.pdfIn PDF document text
    • http://simonide.org/userfiles/file/8635533135.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/19280035853.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/18265372575.pdfIn PDF document text
    • http://vhshf.de/File/21409094008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=site+to+download+any+moviePDF 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_off0000ad9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD9F 15692 bytes
SHA-256: 0e32875f1ad991b20f0096ccbfc2a772eaf59b0ab4f63aa5d8bd57188cfb685c
font_01_sfnt_off0000d5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E6 10480 bytes
SHA-256: 18f68a7207809c9bb08da8a14bce684d833cd2a28c91492c23f42d9ef17e3081
font_02_sfnt_off0000edcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1