Malicious PDF — malware analysis report

Static analysis result for SHA-256 0649e0376d03c233…

MALICIOUS

PDF

85.8 KB Created: 2021-06-26 04:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1af3e104fe0b9a4d26e3b6cc66828a1 SHA-1: 8c7d57778a6d15d770369299a57883136319cc4d SHA-256: 0649e0376d03c233afcd3be5ede3ee8a9933a48e4acc28b61790db5614bb50bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URIs and links to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links indicate an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=financial+services+pdf+for+mba
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3ec6160d9---bosubisar.pdf
    • https://medius.sk/userfiles/file/lesokufibu.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607252c69eff6---sapusiludanoluw.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5ce6ae288---10314683179.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/65d489c0983853e67bfe99ecef88b46a/medukutopagetiberirumevo.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/c0a6f3a743fc98bbf2e462768520f059/79270784177.pdf
    • http://atomleasing.ru/media/File/84425406612.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad70bfae8a6---razumaf.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/zusisi.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ee13bf588ef2f3a3211e26c28da6d407/junonerasasupodi.pdf
    • http://goteneplast.se/files/images/file/wisifapinalofulelona.pdf
    • http://nail-free.com/ckfinder/userfiles/files/dikowufetafigox.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/a2df6430ed5ab43f826d50344bf2b9a3/74239181826.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/4rda7e9no3i4pl9h7kkemqrbo3/reregovewobewasirinepi.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2c8a15e68---52493953414.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607750ef5c388---71540782635.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a772e6535fd---sufutajikadudoripu.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/869354703964d1f61278666e6685a6fc/5529914385.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d4349917---97566479078.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40f17bbeb8---dosogofixetek.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c65feff070e---fevebafos.pdf
    • http://bjaimama.com/data/upload/2021/05/file/202105250606364569.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f75cce93e---8413604962.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c818d7807---32153191913.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_off0000ec35.bin
5ee2f5b2a043698f51be5ccb5a6758cb416ccf14969af8c9389d2395e9cb66f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC35 10868 bytes
font_01_sfnt_off00010508.bin
54b27964e960f3c900876dd7a823b9103485a3b7820cdc1c8ab16ca71a40efba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10508 17104 bytes
font_02_sfnt_off000131c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131C3 16792 bytes

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