Malicious PDF — malware analysis report

Static analysis result for SHA-256 65204736d93cb349…

MALICIOUS

PDF

81.5 KB Created: 2021-06-30 01:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf4d91c635615f0df91fcc2663b16764 SHA-1: 303159b9d764594f30d2cb5c91158340e804cb32 SHA-256: 65204736d93cb34908a9d21363201ccf9afa2a5794c96a08c4a9d3e5c65e515b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings point to a malicious link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://tingyi-bnb.com/CKEdit/upload/files/16704913634.pdf
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/8623bf77d29c0325fc42f876188ea653/zopomareba.pdf
    • https://stradatextiles.com/upload/ckfinder/files/44931475160.pdf
    • http://anhbanglaw.com/userfiles/file/sikitor.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/pvn4ftm46ptksqla4qhnt3sg94/vimikefikuwavabi.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/cb49864799fec59799b6a832d0182c38/jumiluk.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/2m03nir8d2mq64hmnscmp024k3/felajigavefuwuro.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc86acebd7---fogeg.pdf
    • https://sofanet.ro/ckfinder/userfiles/files/raturudizevib.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3ad8e54ee---jopimevuvofewive.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080409b58433---nodizas.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/59c8d8d86f5ace06ea52622fd55bccf5/98873968472.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/9b7f6f57a64251d7799b4b60ff22d31b/tegedewuwodenijijanuni.pdf
    • http://peaceinsrilanka.lk/userfiles/file/73818792447.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a438546ac2---limefa.pdf
    • https://binarbaidtrading.com/public_html/userfiles/file/temininata.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/929807a514912a1512b1108b9dc5199c/80108151588.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/f556ce7fi26ojq03vrp4u3noq5/voxobelini.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b29c58d122855d65926d53d61351d07a/kemetarasupuvenuxuva.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/if04tdg9nv0f4pfnepht6a4ci8/34817485276.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f2321cfa0---mimuviwuvaba.pdf
    • http://www.tobywells.org/media/fckdir/file/muzisom.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=nonton+after+2019
    • 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_off0000dcf4.bin
31f58e0dbe93d0a22b41095b7017abd62e0e195ddd1e33f4fb05928d63fd6697
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF4 10340 bytes
font_01_sfnt_off0000f48f.bin
b936ac145fd4aa85ca17862c314925d74a44fdc5ac879db850532f4cbf2f6727
pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 17120 bytes
font_02_sfnt_off0001214f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1214F 16792 bytes