Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aba21d435600f7d…

MALICIOUS

PDF

85.5 KB Created: 2021-07-07 20:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 511e286511c072a3ab3b3d8a33694cda SHA-1: 11b0aa2313bb28ce87883d73847b700e526c626c SHA-256: 6aba21d435600f7dac6e0cff20bed3c35bf46344fc690db4d34e4a1e1eafa1ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous links to potentially compromised CMS upload storage and disposable hosting, combined with a 'download button' lure, indicates a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/77236076457.pdf In PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/nurarerajalubudis.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079eedd3a968---99089276739.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/31812774382.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/n9bl3o03hd6o3f9l2bbofte4a2/vomabuboraretiguwapamu.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070423411dc7---33509157489.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/timulugokiwora.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/38359482045.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16c7f21c48---larijoganulamavuwox.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/nipevumozobupijen.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1e9a2b0eeb50e5e7a9d3b8d82a0beae0/66705999714.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988cf0a0e15---taposuzitozupalegavibe.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/95866676502.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9a5205d4f---54698901729.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f2966738c---99669789646.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/sirodedesizovotavazoketi.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/77026345866.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/11597646901.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608325e067123---42964946052.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/14853687139.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/lp9f35e10f81v7jukugte5ohhi/70594383724.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/26489152379.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4f908c372---majuku.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16088de38f2c74---nijakakupajixetavidixezo.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b60b2e4458---godefaxeratonobarot.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/dhrf95ekcsshjm5310a3ikrvua/10735362668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=icivics+congress+in+a+flash+answer+keyPDF link annotation
    • 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_off0000e942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE942 17572 bytes
SHA-256: c1bdef71f2d4c754cfd81b3a78e1409b24583e43be16bd1d056196994f8f7af5
font_01_sfnt_off00011759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11759 10824 bytes
SHA-256: e508cb5485bf84442d00a352af8620a75703b176b0a1a6abe74fb69dc603b030
font_02_sfnt_off00013059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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