Malicious PDF — malware analysis report

Static analysis result for SHA-256 7456938ee174dcb8…

MALICIOUS

PDF

112.8 KB Created: 2021-06-30 14:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6be4bf9b1133e8eb135eda98006c974 SHA-1: 89fe1461bfbdd3a73dca2a68502f592108580b19 SHA-256: 7456938ee174dcb872d0dd9d56ec9bcb2a382684f7dfd35aec273206d51a6c10
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://protok.pro/upload/files/gipopituwipopunugep.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e73d919929---69288458723.pdf
    • http://hugslock.com/app/webroot/img/files/6447936929.pdf
    • http://ahxxzx.com/userfiles/202106/file/19852930474.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c041b4885fc---74997312020.pdf
    • http://ausafe.net/images/art/files/63714399512.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/f1lcoc4q5srrnlh9usnak065ri/ginomajaposawatama.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609f19f209f84---gopozorakavox.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/6b302b2839d066172d86a4d721433637/68408765561.pdf
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/xikem.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6f4d4ce16---lukufizenogikajojezijun.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/cps7lrqk7l3soikaf5pmputn56/xetogax.pdf
    • http://arci-mp.fr/admin/File/20809752064.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076a335be687---kosoxiwinot.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c3f1b3bbd---73475506548.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a3df903f8---wefuvekuwelenuneb.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9e95e016e---79561464765.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a60264545---vuselisagewixudajugu.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737e1b94b05---wufebepubolovitaxaja.pdf
    • https://agenziadiviaggiocagliari.it/file/pevizeboweroxuxakev.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/de29189f35d3b8b4a0f77e39cb2c120b/zefajetomogejelewujazunuw.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723b350c3d0---63437979598.pdf
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/zunog.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ano+ang+deviance
    • 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_off00015780.bin
edf2bde2c67918e390ec958801b0c34ce8e25a2504d4b910d43b329de3778dec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15780 10180 bytes
font_01_sfnt_off00016e3a.bin
83a53007a01b32fe3024378e6908a3e131892619fb45cda03222de0f8a89a07e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16E3A 19176 bytes
font_02_sfnt_off00019e47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19E47 16792 bytes

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