Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc3e6f9f240f28a…

MALICIOUS

PDF

71.8 KB Created: 2021-06-21 10:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04d43d7c6a9cd0a20da0e3635ea8e2ba SHA-1: adf71c3a6b2349bd16fcfc376c1c334a732f40d3 SHA-256: bcc3e6f9f240f28aa9e7e455ab7640b80177bb07ae0b9a341be73e4d970996c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall structure points towards a phishing or malware distribution scheme.

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 http://nanumed.ro/uploads/files/nuxexiki.pdf
    • http://kanstm.com/ckupload/files/14778515023.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/5kd708t76dvpulc849nl048g5g/40909882181.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/4ab33cea12454ca687773e9bf65a628f/nububozegekefawaboxupek.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2520875d9---xudumuvuxazavaninanupe.pdf
    • http://netpost.vn/upload/userfiles/files/31456041103.pdf
    • http://afghansolar.com/userfiles/file/pubofipubebanuzi.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/6e284c0237c0cc68a4485a71efe55754/wixabubapevuzulo.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e19ff17584---54121448031.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160ac53cd82b31---46198457916.pdf
    • http://sunjewelsonline.com/userfiles/file/novujapujariromimemaguj.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c84d05a7663---70303407625.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/204f96ea118f479490ed33b5c5ce9825/korireluperawavifeb.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/aqjg9npficvkqnhthdftdq3vc7/gukenemuvavakixulixukero.pdf
    • http://geredekombiservisi.com/userfiles/file/23362583703.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2e06b00eb---zegaxovozotenabefux.pdf
    • https://ikitellirezistans.com/upload/files/23295660708.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=malayalam+movie+cia+mp3+songs+download
    • 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_off0000da56.bin
bda164ec90c8438751b0a154def7379e3a41afa7e67a79476faa6413bc3dce7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA56 5720 bytes
font_01_sfnt_off0000edee.bin
5aa395615c0102f89cadc1ac4ce501b30958c580ff487cd234eafde46cb13b24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEE 10480 bytes

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