Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eda1978e5fa566d…

MALICIOUS

PDF

96.1 KB Created: 2021-07-24 18:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 375ff3ebf0b313f7427ec60438d4faf3 SHA-1: 33bf38434fa7b7610bc1d4f7f77a80dfd14fd506 SHA-256: 3eda1978e5fa566df3a1c9e3a4c51c32b8616c21026862ee6379c28bcb9ae80f
164 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many pointing to compromised WordPress sites hosting further PDF files, suggesting a link farm for phishing or malware distribution. The presence of a 'download button' heuristic further supports a malicious intent to trick users into downloading files. ClamAV detection and ML classification confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/b5ce8a030118054ffd616113c11d2e32/17421737149.pdf In PDF document text
    • http://alpha-cp.com/userfiles/file/wusodukawamawezexofa.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/haann46k6pmqc8ma7lki7t1j91/6540753327.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/0hgidmb1b2cvbq5vpl8ad4gdfa/dogavesebikuwebagu.pdfIn PDF document text
    • http://xn--42c1dhzaq5aeb.com/userfiles/files/pivevudatifadewaz.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/981872001.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90b2c151c---71064333996.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ul3kjc8nmnrts1d76hrjfmnmsb/36102963004.pdfIn PDF document text
    • http://biomehl.com/images/content/files/104646275.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9c68660a9---xikikomubuvototasez.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/12276099466.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160751060b2819---gofapuzi.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b345f435c86---313372561.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/44356403339.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/fisexolas.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/subepufemopose.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/ad13907bc432a2ca7a9378706f741b63/84543856101.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/dbt948pabift8q3f3grgaqte8r/54538106416.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d920304147---zegegugulobisezilurinidi.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/855ff30a35efacb849f66b3b39e7edf6/13607615204.pdfIn PDF document text
    • http://psfund.org/public/uploads/files/cms_files/5714035198.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6946bcdab4---tejitobaj.pdfIn PDF document text
    • http://cpils.com/userfiles/file/janopemotituvakapewitekev.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/62524838921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=ultraman+fighting+evolution+3+ps2+iso+coolromPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001022c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3E 17916 bytes
SHA-256: 845100482509ebd7f6c23fb2e4722f31e1c6bb685bcbec9044c11636211580b8
font_02_sfnt_off000148a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A9 11392 bytes
SHA-256: c77a7020991a32a703f05278e4d4a887c6f732a9e5311b7351c697b49e73f4da
font_03_sfnt_off0001636b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1636B 3496 bytes
SHA-256: e640330cee0f34b476f060e3fa80c53d8f8e53f2920daded9178846860453a57

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