Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c57c8646d99c54…

MALICIOUS

PDF

84.7 KB Created: 2021-09-18 09:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8f8be09a7c77e8e54b934d064ea8d4f5 SHA-1: cf37033a4564be24c4c39b12a63ed01e9cc5dbf5 SHA-256: 62c57c8646d99c54ac0cd64f0543fbd70e15fbac54d9f27bf0db76883d893d73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://synerhu.ru/uplcv?utm_term=best+news+apps+for+android PDF link annotation
    • http://yuqiaohome.com/uploads/files/202109071324431911.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/60469709710.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/28020734611.pdfIn PDF document text
    • http://vaynhe.com/upload/files/fojitajudepekoriveturoxiz.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161408efa5361f---zoduruzune.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/vawew.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/88167712519.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f67ca183da---44935348691.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/xijafepinobobifalavepu.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/xonaxolaxezurigederu.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/52949862710.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/zewalowererikuvezekib.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/83621978530.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210903_94B64F237EC3D050.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/votumawumomatudagi.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///leloxo.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/98163803175.pdfIn PDF document text
    • https://sergiomauri.com/images/file/mixomo.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/rilaw.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a198cbbac---rarozurodotobud.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/wuzenijojasakerasop.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/97545244041.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/30381905617.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/55990364118.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/55512647302.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/22065712342.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf92b7d45---wuxarix.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_off0000e6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFF 17672 bytes
SHA-256: 0d10b096baf29c15a473f3ad81ea27925e6d3ba48852e04c1a713d659b57916c
font_02_sfnt_off00012cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEF 10584 bytes
SHA-256: 3d43231850b1c0e04f2ac63987b3155b7f40a92842d163477a63964c2bbe0382

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