Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e6b0241b93a5853…

MALICIOUS

PDF

77.9 KB Created: 2021-09-24 09:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 44b5cd2432346abd33c34ee24813e542 SHA-1: 7e6b71336d3a33a154b3bc380cfe591dbd3ed1ad SHA-256: 9e6b0241b93a5853721a2922b0a71387984ab56d171a9a95a7166c8b44c6132d
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of `utm_term` parameters in some URLs indicates a potential phishing or malware distribution campaign.

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://catamma.ru/uplcv?utm_term=apk+instagram+old+version PDF link annotation
    • http://doudou.tw/userfiles/files/bapoxabibenotovetajakaf.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/mitubur.pdfIn PDF document text
    • http://wamer.org/userfiles/file/97424640015.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/94534552073.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/33374607863.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/kavamotuzipuwogotimi.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/boxopalevi.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/84347545895.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/93997074902.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/ladaxoleb.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/83340814794.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/7380151207.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/dgk40a7nj40lks93mepp78m516/jikavosebefugakixowosedu.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/salawiwar.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/20617616717.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/45618470627.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/07g8s986h9ehs0cr23atsk8san/95382605011.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/tevitisuvolabes.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/97435143631.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396a91941ca---juparajuvi.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/52931157977.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/pinamut.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/soxowuxube.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/64608156408.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/75310305998.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/19201108463.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA55 10876 bytes
SHA-256: 94768f9fcd7a2f8b86b6c3b73f82d89e9443128ad2d403f69c0dd4886203b351
font_01_sfnt_off0000e350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE350 17864 bytes
SHA-256: e06a4c8418174cb2617dd750e42cca4693cb0acd6cc8c2724623bfd00dc95dcc
font_02_sfnt_off000111c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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