Malicious PDF — malware analysis report

Static analysis result for SHA-256 03bbd8632684f366…

MALICIOUS

PDF

79.0 KB Created: 2021-09-02 05:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8dba3d110bf72b93d49099e53c6b9a1c SHA-1: ae3c1b4e2f64f1b0da0c3a1caa5a6164fa175e23 SHA-256: 03bbd8632684f36602159d7280af03dc5dee4affb40a5d52c0113cacdce8b74b
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated high maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress upload directories. The file's purpose appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d900d8873b8---xozomasatosok.pdf In PDF document text
    • https://pima-alarms.rs/slicice/file/8900784911.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/kakakopikulas.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ed5e96767---88693812384.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611a516c6ec95---14876566368.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/xowododakimitagomim.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/d8k1qj6dero23bmbqrokonhtqq/95231865482.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1611ea804dc980---jovafilifeperi.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3b1769f5ad08253ec87a17b8333e512/peporabunitakuzotoxe.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075ce98f3841---beboromedum.pdfIn PDF document text
    • https://paradigma.bg/uf/file/dawegirugoladudimef.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/34d3e7267f998e80f82e00f881577ce2/venurifezatofususaxegiga.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121b9e4580b3---gabimuzuku.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/79570382413.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/46017576056.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079398056fd3---42521698215.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/212d374cf7d0670addebc398edf1f769/rifevexafaxo.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/19367664603.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/jotab.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/44115202540.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/sikobexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=affiliate+meaning+in+bengaliPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2625c911a2---7433961779.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_off0000cc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1C 19416 bytes
SHA-256: 0be128b31f083fe5ebed43411b9e126d07c3d479dc07d6391dcb9ed9329dc613
font_01_sfnt_off0000ff37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF37 10288 bytes
SHA-256: de396daa5fa93e05f4e1f237b0f2544c812236b7f6c6b37f60fc7a237bc593e2
font_02_sfnt_off00011654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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