Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c63601d8943432…

MALICIOUS

PDF

77.2 KB Created: 2021-09-03 02:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8714fb13855ba4789d109b6f663eb340 SHA-1: f9ae978ca6394b38a960b69829a3520eaa48979a SHA-256: 40c63601d8943432c9ce9ac6f14e43b0cebb43a9b2ef4b534fab735fc08d24c6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://yizhu580.com/ckfinder/userfiles/files/73347357781.pdf In PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/a6b01eb44504b1d43771ad15d7732f12/fasawamifizefapolu.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/dujenexudo.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb65cc19e79---66975219914.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/91799635762.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/58847237145.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec96a304d3b---15291426109.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/tutibuxu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160996387b21fa---jazovoj.pdfIn PDF document text
    • https://campermagazine.tv/public/file/nisemanila.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/pinizanugerutabigo.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/sader.pdfIn PDF document text
    • http://maihome.hu/admin1/file/digilibatadagalelotu.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f87dc77f06---relutezeketowutaselutiza.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afe16f4e984---fibipewudokefakek.pdfIn PDF document text
    • https://atl-50.com/files/file/masiseluxunafowefu.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/fepujopebesikunajupi.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/59124340071.pdfIn PDF document text
    • https://menu2uplus.com/images/file/29193493545.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/46809491538.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f365f73b25---45985862310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=adverbial+phrases+pdf+worksheetPDF link annotation
    • http://www.thaiticketmajor.com/static/imgUpload/files/zugilafopufobalijizimo.pdfIn PDF document text
    • 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_off0000c81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE032 10856 bytes
SHA-256: 48a70147aa498465911cfd269466996be1489bc0690a0772e25344ff4be5aef5
font_02_sfnt_off0000f945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 17776 bytes
SHA-256: 52cbc5202d536bd624623625035533acba72ea522c0cefc6de95da13aa571966

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