Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65c5a714abf34e4…

MALICIOUS

PDF

75.0 KB Created: 2021-09-04 20:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0cb1ed7665104554996e98306dd6ae9 SHA-1: 20a6f805133596711db3a2316a9ac181c85a1ec4 SHA-256: a65c5a714abf34e486fd8f6e74a9495b017cd501083e2e7aea95536bdf6f3309
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting sites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://rkdestate.com/userfiles/file/45469248857.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/3bf73tqmktanougf7hbkdio0b5/voxamaxuwu.pdf
    • https://33mobility.net/uploads/files/43138428310.pdf
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/wokoxemozivado.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a811a05434---gusukizozakezarigunafut.pdf
    • http://synfarm.com/upload/files/nofuwiwuvaromutaranidago.pdf
    • https://brawlcall.com/ckfinder/userfiles/files/molorakapumogisapalasu.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/6a11b4523afc40f847b0b08a7f0b69cb/46167615035.pdf
    • http://susanirvine.com/clients/82887/File/werufimilusinije.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdccad8e852---73503603495.pdf
    • https://www.ftha.org/admin/ckfinder/userfiles/files/tarejowifejez.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/d3mmhdiek28pckknt2ejhi0jb9/88203219197.pdf
    • https://bellcera.60km.com/upload/files/roleros.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/f332df50757f69b716023178826af29e/xamuboketuxozubozofe.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745e0ec60f7---32724137980.pdf
    • https://mintowncoffee.net/uploads/images/files/95541683222.pdf
    • https://shiphangnhanh.net/uploads/image/files/burepunafoju.pdf
    • https://ijtm.in/userfiles/file/25459046169.pdf
    • http://icwest78.com/clients/67591/File/5841881309.pdf
    • https://xanbiente.de/userfiles/file/gekizisubefasonapoluvane.pdf
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/zudazufuxiwifagunonava.pdf
    • http://pelejas.com/IMAGENS/CKFINDER/files/38055133696.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609650d102c4c---gasimavemudibego.pdf
    • http://kencert.vn/uploads/image/files/719916169.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/vvfvmm8kcjhrp1sflqbuubcag6/pikugikitasebenu.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b398e57ceba---noxuxejelopu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=world+bank+annual+report+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_off0000c34b.bin
5db74b9a37dcc242b91caa3c02a454afa0be06e4b6020586889b94f64f4275ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xC34B 10556 bytes
font_01_sfnt_off0000db47.bin
93d6c6a64b78c39c2afa532639b281ba57086de0f7b1be99190a1850746c01b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB47 16608 bytes
font_02_sfnt_off00010601.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10601 16792 bytes