Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc78c51bc2602db0…

MALICIOUS

PDF

79.7 KB Created: 2021-10-09 00:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9b044cceb687ee7ae94b98f8c4f3de4d SHA-1: 68768fb1718f36759270110eb5e59dc289aca33f SHA-256: bc78c51bc2602db01ea3dc34ab23c8dc7eafca71b68a180149b95efa60071670
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as a PDF containing a link farm, with multiple heuristics indicating its nature as a potential phishing or malware distribution vector. The ClamAV detection further supports its malicious classification. The embedded URLs point to various domains, some of which are associated with compromised CMS uploads, suggesting an attempt to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3499

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://allytemp.ru/uplcv?utm_term=permanent+formwork+for+suspended+slabs PDF link annotation
    • http://carmakers.cz/userfiles/files/wusafuwu.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/fizuguguwinobibujafeke.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/zudoxumerizijesu.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/xibirasox.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109240220224470.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631473405sjMH.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/zitizojewobawawetubosiz.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155905bb6262---1968443002.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/ninatezaxotabilexixuwes.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/kawolipizebupupek.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/jisaguv.pdfIn PDF document text
    • https://businesslife.com/content/files/zubulilokafesoxelomen.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/bifowurole.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109130208525916.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/govelimo.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/16851105056147ce8124f53.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431e3607a10---14585273750.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/riluruzijupam.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/14979540547.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/xudiputuwaf.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/nakajedaneme.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/akjr89vs09scug0th02bvmn6sv/lomat.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/48064664279.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D41 10984 bytes
SHA-256: ea20ec06f4c10d12bdf3d0383191364dc5f687e8d731878a2a24736bd83c060c

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