Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef53543133c3991…

MALICIOUS

PDF

72.3 KB Created: 2021-09-18 05:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6ba9fa1b238b51670ab73edf82bcd0d0 SHA-1: 7c268a2a1891c8fa54f7b07e46c9a2370033c7ef SHA-256: 7ef53543133c399113241ba0b34c3f9fc0706ec04ed85e88c5623fee1b6598ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hotelalbicia.com/userfiles/file/nirisadijawusibowavuber.pdf In PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/simuvopexafowejofiban.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/ketulefanusobenujuto.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/55758335922.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kurefuvabobir.pdfIn PDF document text
    • https://tuinvandecruys.be/file/52878764825.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/60492453008.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/mosatapafolulopiboratar.pdfIn PDF document text
    • http://njxinbell.com/upload/files/fevixutudovofep.pdfIn PDF document text
    • http://masonhn.com/d/files/bunofobe.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/45949190585.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/58527955404.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/96030783469.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450dbc476eb---mepari.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/29403736245.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/96045882682.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/kapuj.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/q5u3cc58d92b51mo57lauuupmn/deler.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/zifikevaparikepini.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/sillkeak8gm56u9vda1v9imav9/89486713342.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613316b4bea66---gisalibox.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/zogagebob.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161356edbf24e6---89441507473.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/21399824314.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/kozevidisoxorovosapo.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/kavajobulonewugipidad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=funny+the+end+gifsPDF 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_off0000bb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4B 10396 bytes
SHA-256: c993ca00af27daab1310c87f60502fa2a4039ae8e4b14e2151b0c8e42294e848
font_01_sfnt_off0000d286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD286 15972 bytes
SHA-256: 8fad0e0ca6ce35d04a0b8fb962851236764c5be2422870ab7814fe8af9014508
font_02_sfnt_off0000fb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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