Malicious PDF — malware analysis report

Static analysis result for SHA-256 601cb23e353387d4…

MALICIOUS

PDF

62.2 KB Created: 2021-07-31 17:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 548296ca37cbbc6552623f5cbb1dc7a0 SHA-1: cb97222b43cf12daf3ee3989c1513f11d657e691 SHA-256: 601cb23e353387d441bf5de7652eb61c819bbc4e6a51663d4291d2ee294b0c4c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the links suggests a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8336

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://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/72967362085.pdf In PDF document text
    • http://aaaexpressac.com/userfiles/file/kuziruzodikanuram.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/wigagukowufimawumomojizo.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ba2cc6d13a0c959fb3e2b1342bf14c51/laserodarawifuw.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/55803598549.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/75226672605.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c957101233a---39107694410.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/81217908132.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/cjsnh3k9jpf1tfintpq3jk9nm4/dadewavogap.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/lekidisekufoxovexurelusug.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161045cf354818---91052564709.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a3d191039---vakofaralerobivubunize.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/c2c544ab9918a9e79dff90f865cfd4a8/zusiganemijuderizo.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/dad5eb66d2763afc506fed0c124e0fae/seluwuxaru.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/2593151501.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c5d7cd566---6970674765.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/gixavozefu.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/wofepekalazelev.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a12a8a621877426519e3bb80618076e9/57041532923.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/8ff3750730f1c5841ee6f19e65b1fa3f/pubemonoj.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/5548517363.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/b89bc3fb1dbcdea3b12050ff36c2bf30/bilaronorik.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/59195133047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=kz+spree+escape+owners+manualPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 10584 bytes
SHA-256: 2b92513598e55697bae5354bef15fe6fad0b9bca1cc56ad28fff03a32f656251

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