Malicious PDF — malware analysis report

Static analysis result for SHA-256 e427ce9ad234b3bd…

MALICIOUS

PDF

111.3 KB Created: 2021-07-02 00:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f4d681ac91302640c7e8d2004b5c7b4a SHA-1: 4c7336ed06d3024d1daff1e9d3f48f3faacb0e75 SHA-256: e427ce9ad234b3bd4bb891093a7e0e0323b7401462e37b652b84a054035e9faa
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, and a prominent lure to install a browser extension or update. This suggests the document is designed to trick users into downloading and executing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://aadhaarretail.com/administrator/imagetemp/file/degukupovinevir.pdf In PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085f79fe2b3e---55143930597.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/d4a1fa794fd4f2b34da40b47b9ff125a/99439310809.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/remozekamudenuzir.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a5c33c247c6933665a7a2d73e4c10e27/97195675532.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed57de99f4---jipixebizoputitiko.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/19155036318.pdfIn PDF document text
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/nuwisimadexofukozavetir.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e631e7913e---bokozilonojuferurewu.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c03f8c4a3ad---3354420177.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/5i1nlh8nj6mefn0vvvm0vqgm5t/lidividovisokuwidopod.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/86292571905.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/24869027515.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/nuleza.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f0692e1fa---19509508180.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb9644541c---51287040346.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075dafb71685---6421233816.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/53496332444.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/66344644347.pdfIn PDF document text
    • https://bliznacite.com/files/jepawofirovobudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=app+to+check+grammatical+errorsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000139d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000151e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151E4 17940 bytes
SHA-256: be555452a5de8c7f24ed70043c4e186f82cb3db6a6e3a23b6da6696cf4d06b87
font_02_sfnt_off000180d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180D4 16220 bytes
SHA-256: c9d310e3f05ceb503418a5299038822c3e71cafa139d12e33d730308607643be
font_03_sfnt_off0001966b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1966B 10788 bytes
SHA-256: fa458a18e05f9c8af2325caccf42dfe85b45938feeeda3dc9e2a13fe755687d6

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