Malicious PDF — malware analysis report

Static analysis result for SHA-256 157c2dde964dba2a…

MALICIOUS

PDF

84.3 KB Created: 2021-09-17 07:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1ffcfa04dd109fb0a493cef115003a2f SHA-1: b98dad35db672050081b5430bf39eea64794fbd6 SHA-256: 157c2dde964dba2a5f034f80800f4dc2361fe0d96ffdc58c54978397e1ecf150
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure victims to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://crysiq.ru/uplcv?utm_term=it+had+to+be+you+read+online+free PDF link annotation
    • https://watfordfairtrade.org/app/webroot/img/files/50188417706.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630770312_2f68ce48fb.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133982f49095---10275788290.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f273fbcecb---73865108098.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/tugobajaxakisesiloga.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210910202142.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/17129278163.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143ee5e4f89b---22985483140.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/wepupegixapug.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/daf7290f030477bd89ab223f31b977a5/40084923903.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/kiriz.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/nefar.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/19566496190.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/73449836404.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/51185492957.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/jewobuv.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/kogigalemanugoruzuxoso.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/11053288548.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/rovapubijapakezip.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/161390a01af97f---xetonakovakoranawepadiseb.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e245b1d1b869d924c5030b167e3db5df/nifip.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_off0000e4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DB 18084 bytes
SHA-256: e3caa59d02c458624e61b7ee90aff4ddbf4b982aa63424f049bef29d6212e220
font_01_sfnt_off000113b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B3 10588 bytes
SHA-256: e48923a737f68d05d3eca44df4f23ba444945623d6f0aa884f70f442929d4960
font_02_sfnt_off00012bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1