Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdfcd884fb966bfa…

MALICIOUS

PDF

88.4 KB Created: 2021-06-27 08:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b439875de03d52b93af0338c2837579 SHA-1: 5efeaa27e474ce19b49ab33c6f958025051b1946 SHA-256: cdfcd884fb966bfa6df1d7ebb827ab282631881802001340e0544f4ecd84aa1c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The document body is unreadable, but the presence of numerous external links suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/3e2e18f0560a7d9b9e616feed3286d3f/86349380772.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0fcc30ce6---rituvag.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094a06ae2701---bowesajudel.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ef9958350---60109086714.pdf
    • http://quatang3t.com/upload/files/28292362009.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/c83c1bfa4b17184f853a2e9465cc34c1/jupedadowodu.pdf
    • http://sure2trips.com/bot/ckfinder/uf/files/buwuvadazolomagitudugub.pdf
    • http://kibbkw.com/uploads/file/vezodudebamirodopenaba.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076b5cfdce75---motunopelowiketagekexiwo.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16073238c1f838---wuvuse.pdf
    • https://dpengineers.info/admin/userfiles/file/ruvadejovisagiwejafokuriz.pdf
    • http://vyveva.eu/UserFiles/File/83697353665.pdf
    • https://total-sport.pl/img/upload/files/48483704150.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16099b8cfdd440---15612591703.pdf
    • http://lacasedescaraibes.fr/file/10395426376.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/721eacf176d82b5126b28006cf3d3533/tapima.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c6d623fc6---44805643822.pdf
    • http://quaretti.it/userfiles/files/39090967862.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb3c6cd21b---guxokiledarodedu.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e90fd91ce---xaremus.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/makosetupajesuko.pdf
    • http://jjinline.org/file_upload/file/wesefenijesoros.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/fnckfedo7eoddk093menqnuhe7/jikenosuluvesisovakoxura.pdf
    • http://www.asslar.de/downloads/redejikivegosazukekeju.pdf
    • http://aelma.com/sites/default/userfiles/file/towakilarifonesaxinotunef.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889dc10116f---59215065843.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=operating+system+not+found
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f362.bin
21f6ee31baa071d7cf81ec3afeed3b852f57f495ff2517077ae07e83122a7700
pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 17872 bytes
font_01_sfnt_off00012288.bin
0721d8ea26a868f8f0a88391cd0f1bfe89b8ec8b7b57d3db77aa1c11e825e33b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12288 11036 bytes
font_02_sfnt_off00013c0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0F 16792 bytes