Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f86c8e866d0888…

MALICIOUS

PDF

85.1 KB Created: 2021-09-06 06:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80132bcfa9f7440798ece3662a154894 SHA-1: 46252ed37531641ac78bc867c533ed0dba488068 SHA-256: f5f86c8e866d0888895809db452672c906301e6273a550e05b62998f718d7137
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mbcasc.net/imgs/file/23505096696.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b70a84514---tefutogagigamujewa.pdf
    • http://vatlieubaooncachnhiet.com/userfiles/file/35463919543.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/e1166fec093c95ee93896e124a1c7209/nobekudakevijusokomun.pdf
    • https://retrofitoman.com/ckfinder/userfiles/files/39665522653.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607710c0e20dd---kuzaniwep.pdf
    • http://esipro.fr/userfiles/file/84664612074.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079bd725dbff---92166745124.pdf
    • http://blessingsngo.in/userfiles/files/59685850110.pdf
    • https://www.epicbrands.co/wp-content/plugins/super-forms/uploads/php/files/c8f21ede6106ead584e8a9515f149c41/jiriwa.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/9pbq5dc6gmom027r74663ongb4/58538468749.pdf
    • http://naturalmis.com/userfiles/file/vegenuguju.pdf
    • http://flapboxes.com/userfiles/files/zavuxijufefonavaxara.pdf
    • http://openendrep.com/userfiles/files/86172747492.pdf
    • http://wearefamily1234.com/clients/3/31/31b46d3307e4516335aa88350909469c/File/26836204717.pdf
    • http://web68s.com/upload/files/19773703952.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/a9f264d33c707976bbcee03425e02d83/nenijudabafonefezo.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2239a59ff55b119b3eda4592fd57a7c1/jigolusepe.pdf
    • https://economiadecomunion.net/ckfinder/userfiles/files/nusikuxonuxunadeleb.pdf
    • http://standardamulet.com/files/files/46686394268.pdf
    • http://raczcsalad.hu/files/putupexa.pdf
    • http://ylplj.com/ckfinder/userfiles/files/6939842746.pdf
    • https://kaisar168.com/contents//files/rosowenupajalofasoja.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=fle+compr%C3%A9hension+%C3%A9crite+a2+pdf
    • 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_off0000de4a.bin
30373b888db6032261d6e059b85dc0615c8633326f00650bbf5a52d25906974b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4A 11136 bytes
font_01_sfnt_off0000f7c9.bin
2d40eda4f03bb977a51b24d182db4b49c285ac48065804b3fa6da2411e8ef9f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C9 21060 bytes
font_02_sfnt_off00012d24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D24 16792 bytes