Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b7785936aa0089…

MALICIOUS

PDF

88.3 KB Created: 2021-07-02 02:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 340f18f4ef2909addd6533f1c22e6fc5 SHA-1: 3da0934502e5634ec3612add4e8fa7ce4e4dc0b1 SHA-256: 66b7785936aa00896f89b860127ba4ccb3e948c4dbf763b59b8b310e6cfd24de
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

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 http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b96684d17---58246925830.pdf
    • http://askort.pl/Upload/file/kovobazigijuvurifonirub.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/uf1hso76t4ch2611469kf8ifhc/wagojirap.pdf
    • http://temple.mo/userfiles/file/danegosifowe.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607595c80730a---sepuzigunuwonu.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/a64a6155dc7d6f01d8d1b0a192702234/79773652490.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/vn8b5d7bm4sket5gf0cjfvfsd5/sisupidakevibewasuda.pdf
    • https://aduanaldelvalle.com/userfiles/file/54921644772.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/4sov8ordan8tie1ur07fap8ll6/zubudebijuruweruludunara.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cff005937---tezepisigogom.pdf
    • https://aviseco.ro/userfiles/file/gudefazadevevuwof.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/bizuziperadisaxofuvet.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/979082187fe2fdffd365d91d3dc8da86/tiwota.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cfed87d55---xinivuponukikog.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad3b19e3b---89411300505.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/bab136ae121035c9e768713c2466de05/tagozudi.pdf
    • http://ahxxzx.com/userfiles/202105/file/45700371674.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e6b724603---kujavitovoguv.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e68b3b635b---68925050016.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2himo83ikctoaiqghu5pi05jf6/fanumisivagutip.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdceed2eb57---tupejorivoba.pdf
    • http://meble-tk.pl/userfiles/file/31558672189.pdf
    • https://ecohort.info/userfiles/files/firerifapelivafoxe.pdf
    • http://agcslohian.com/userfiles/file/24589540929.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=as+a+heads+up+synonym
    • 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_off0000f6bb.bin
f06734089497d2d37812bec6c85fd8768ec1fca0426ef8f9cbd132ae747ac3db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BB 17528 bytes
font_01_sfnt_off0001240c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1240C 16792 bytes
font_02_sfnt_off00013c23.bin
67283b1212b4538d1bb7c82b9b9ca013875bd948f528d465df57ae002c30eb71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C23 10516 bytes

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