Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb91ce32f28e7097…

MALICIOUS

PDF

73.1 KB Created: 2021-09-12 18:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 679d64c1b13d212d78f6de380ca7d65b SHA-1: 73f89f930d01822b6d15a4656ccfb95991f5643b SHA-256: cb91ce32f28e7097ee495348680e552e23a0cc9df1e46d1d858fc601180f8518
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised or disposable hosting, suggests the PDF is designed to redirect users to malicious sites. The 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics further support this, indicating a tactic to obscure the final destination or leverage compromised infrastructure. The embedded JavaScript likely facilitates the redirection or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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 https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff12cabb11---552033115.pdf In PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210909_1581A631861E1D93.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/46296812856.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/dijinoso.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/vafuvubusovovajumujaverir.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/5slk8hdluhpu03re1novihff8b/5300741149.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/xemolinoxuxoxebu.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/23453800941.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/38146671345.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/98085718735.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/mowuvopuganufanivi.pdfIn PDF document text
    • http://ed-union05.ru/files/file/62519918849.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/66933115678.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/926ff194b8001138876bc32025a400a6/21047043626.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/77269338164.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/82551134488.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613303d3adb23---40849790323.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/16657777836.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tenujopetafibak.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/70211295792.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/jonuk.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbea57976d---kelupizegavufomiwuj.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/7367029343.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/87379956725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=hide+apk+androidPDF link annotation
    • https://mediaget.com/userfiles/files/64230158532.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_off0000be5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD673 10156 bytes
SHA-256: 72831622128319ab6343e5cc3cd37b43a33ca095caa563e64a760ac975e4ba1d
font_02_sfnt_off0000ed2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2B 16164 bytes
SHA-256: e430909e5db152590b668a4ba5ae25725d541ed55caed94706cc39d1c5d5e63c

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