Malicious PDF — malware analysis report

Static analysis result for SHA-256 9345d989984935a2…

MALICIOUS

PDF

64.0 KB Created: 2021-09-20 21:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e85b43a449d73046c1fccd92b427d31 SHA-1: 30fb122e7a7e1118b0f75c3a6a8063c8ae380eb9 SHA-256: 9345d989984935a204bc404b80fdcb795f2fdb9bee93b6f3289192ebe011d3bb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware distribution, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6701

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 http://gorod-r.com/userfiles/file/nupelulusujuteriwoxine.pdf
    • http://csc0351.com/userfiles/file/20210901220459_k522cp.pdf
    • http://konsultacjenaukowe.eu/Upload/file/45056509523.pdf
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/3605964513.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/afc7968a8b8299d0cc0cb4556c0269ef/17134577988.pdf
    • http://aecvfcom.nrgence.com/upload/userfiles/files/16073664456.pdf
    • https://marljivo.hr/userfiles/file/suruzi.pdf
    • https://ngonluathan.vn/images/ckeditor/files/75367632174.pdf
    • http://seasonmediagroup.com/pic/file/94779295596.pdf
    • https://hsiaoying.com/userfiles/file/mexefepasagukigo.pdf
    • https://posaonakosovu.com/ckfinder/userfiles/files/mafixuverigorofob.pdf
    • http://bongoes62.dk/userfiles/file/zuvinenojemajid.pdf
    • https://merohamro.com/ckfinder/userfiles/files/553006954.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/4199dac754f03630aa99e74c9b13e59c/37806694072.pdf
    • http://puebloexec.com/userfiles/file/lupow.pdf
    • http://china-hold.com/UploadFile/file/20210920045852986.pdf
    • https://shirbandifelt.com/userfiles/file/gudisewib.pdf
    • http://dellalontra.it/userfiles/files/talesojitidosop.pdf
    • http://stroyindustry.com/userfiles/file/pedemu.pdf
    • http://goksirkrupskimlyn.pl/img/upload/files/xojabukexibepu.pdf
    • https://hongmao.tw/uploads/files/202109011804596454.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614164ba0194a---kebagepetabojizoxabuweful.pdf
    • http://kfoodntea.com/dataroom/file/zugiwopalagefe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=add+custom+apps+to+android+auto
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 16792 bytes

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