Malicious PDF — malware analysis report

Static analysis result for SHA-256 664f747ad04fed8a…

MALICIOUS

PDF

64.6 KB Created: 2021-05-04 17:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d8d54d7e34563d8181d0ee3a14cee45 SHA-1: 0c25c268bee44eab32930b53ed40f78e0d8e9135 SHA-256: 664f747ad04fed8a512691c0443760753f7aaa653e45bc11393c94d2d977abb4
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites that host further PDF documents. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to leverage SEO or disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8599

Heuristics 5

  • 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
  • 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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5dd4d74a6---sudoxok.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/1effde41f0c4e81b33dcdfde84569d0e/tonisadidenijugajo.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/ac9ebbdb050cf7688b6148d29e40af72/49461266278.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3c4d89e28fc5eddc26f690e356788884/ximosazojakopogebav.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/40a972a00fbb275371529d3b69f69418/nogusixunaluwokilipo.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/2ffbd3a1f2f33a338fd8b2a6babbdb72/zivuvetezot.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/fuean1cuojkf6nal5kfrnq12k4/perevubuvakurisem.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/296d0b74b541e83b52fccd7e40ceb491/9764821591.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/e0a10247840c5688824984a5c4eb6a54/wenikuked.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/rlgvl5jl7fsc6i2tfsuf1s4rdc/viwaroferimubazumu.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2348a628a---71117443266.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075c76f5c5d7---10268144800.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/30e4528ba15fbef30672996d2da5524d/37020966834.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/477d1c23c81dcd4d5a95bdcb92cde389/9599941198.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160853acc2b221---xudojepezalamamejulatejug.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608baa793f661---nufazi.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16083c0775fdb1---31390640024.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b40927d0a---rabegisumorekufiloma.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=financial+accounting+mcqs+with+answers+doc
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbf1.bin
01b61389291647acbb0eb7360ccee85da43556b28dc9aa6a945025b6d059b9d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF1 5524 bytes

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