Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c0da9d7fc039ec…

MALICIOUS

PDF

68.3 KB Created: 2021-05-14 10:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee05bf5f66196c2eee562f8c7c0ae5da SHA-1: d3ed4820f0adefbe8c24dc966a237c4973ee9604 SHA-256: 66c0da9d7fc039ecdb20d288457011f90ed7917851f8377f103c8e7278caa609
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, which is not inherently malicious but can be used to create deceptive documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://avigailpekelman.com/sites/default/files/file/38488704467.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/tigikanoxesedirijin.pdf
    • http://interwork.sk/userfiles/file/58113360525.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/198374da621c063dd912b2c46dcf1c3a/labijukopo.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e323d1d8e---savefewotozenajegulod.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/7205e2776e1f33ef8f65c600ec60ec21/53116545471.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c0f8eac9---81830921802.pdf
    • http://aep-tc.com/cache/fck_files/file/57347279275.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607158981804a---18553555582.pdf
    • http://ersatzmonitor.de/userfiles/file/45946569862.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160835c625d402---xonov.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/a97476541d0641decb94d65ddc8682f0/fawitugapavonuxedove.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/103d687c5d7773f34d6cef186ba59822/10258850467.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867460d0d26---5908993852.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=fruits+vegetables+worksheets+kindergarten
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce1e.bin
f307ebeec08cfef2d9920e2b6815e9a79defe6aab8b44a155a55ae4800a2b612		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1E 5396 bytes
font_01_sfnt_off0000e088.bin
f9554c26a5acecebe5aa9ae309f1b2489ac8c481603dde1b6034e3f0fd926d86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE088 10452 bytes

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