Malicious PDF — malware analysis report

Static analysis result for SHA-256 250c6b0846939586…

MALICIOUS

PDF

93.1 KB Created: 2021-07-03 00:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f33ccccf93333004983fcdcccc85e70 SHA-1: 7628052ceff0aca3474cdf5cb2510d24e4447e66 SHA-256: 250c6b084693958659de78b73b518cf802b991a3d2a3c66c622118c61593c047
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host and distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple compromised CMS upload links is a primary indicator of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098505346086---3803979306.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d01a8ae106---97176714454.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607593c6aaef8---49571151743.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed507c3398---videsunevivavow.pdf
    • http://worthingtonpark101.com/userimages/xitiziki.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d89f55a976---xodulidaloxex.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e28a61494---xojugap.pdf
    • https://tradingphrases.net/userfiles/files/46152427430.pdf
    • http://massageindex.nl/images/uploads/puketejepij.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c00c35b3872---petalavewizoxomani.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cdb2cb3fa---zonisejuwagofapam.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160958a8e1d232---78183745250.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/d58b6411d62fab8a8641264cc3f80e16/23510633616.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/5nlj69arevtfdh6b3qle9o49n0/mavome.pdf
    • http://gandolfiarchitetti.com/userfiles/files/66477528230.pdf
    • http://clubselectionvoyages.com/images/file/finuwakigotesekuwe.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/489602520e35f74656dc73a2c0a971f5/32720871973.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210612071835.pdf
    • https://banghenails.com/upload/file/45856017110.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076c80ba88b6---87944930600.pdf
    • https://appfacile.it/file/zutijowuza.pdf
    • http://laduses.nl/image/file/vefevirexofadasiwe.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/baddac7650ec0b7e9d8d5d1ba6dc65fa/dalibomusekeziv.pdf
    • http://richmediahouse.com/admin/uploads/file/liremozepunadukeda.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=all+project+pokemon+codes
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eccd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECCD 16792 bytes
font_01_sfnt_off000104df.bin
0a5d1850b9ebfbf689fa79b0ee7aa1f2a7b4f3905d7f911aee73d2e8888f1653
pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 19188 bytes
font_02_sfnt_off000135ce.bin
117ca045130b45eec9502d0b05f887fc997a34e2844a3d146d9780b1f29fe15b
pdf-font-stream PDF embedded font (sfnt) at offset 0x135CE 16660 bytes
font_03_sfnt_off00014cc0.bin
17297fdada689ffd96dda495d401cfc2ec1284b0021bed7841076df0912d73cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC0 10624 bytes