Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba771dd9db08dd4…

MALICIOUS

PDF

119.2 KB Created: 2021-06-30 16:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0259a94f3cec3dc996879d236a561612 SHA-1: 419afd798a8301c4f52567d85efae6cb67e84f5e SHA-256: 7ba771dd9db08dd477cd45ca247616887dcda902e2e76603b3f3eaae50948c2d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9772

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 http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c140f9683a9---56116973444.pdf In PDF document text
    • http://aven.su/userfiles/file/diduparikepinebofuvi.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32ee3b598---56064579474.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/99e9a1dacfa8dfa9bef64b28334b2f34/14446705757.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/6ioj1c19u35bloac3fc8n3g6qj/ninonibobebol.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/4f1d7f4fea8995155047653e42d2b1f9/78953629949.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/pm896hgfb7pq7lb7gfot439ad8/94229171178.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/93097657372.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/qv8se9cgatki3h6jouvgqth2bt/80143274086.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/7jb6vlt6noblr7npd048r403kv/voxerebe.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/e38359dc9793cf6cac86e3f99af1b4f4/46827426573.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/31aeb347966e70dd49beff9c9f354b60/satoxafiwukotadovimux.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d13911a88---91928890380.pdfIn PDF document text
    • http://faktxeber.ru/resimler/files/76933002804.pdfIn PDF document text
    • https://activepymes.com/pub/file/tuxuxebuduru.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/49281412131.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/12616946564.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/52830548331.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/cf5610c14bf0d26f32dcc5e9a2680b9b/39241847773.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/jolobozumij.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/81290812437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=be+frank+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000186e3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x186E3 25688 bytes
SHA-256: ae78ba8fba4638da1f5c3034e850f86991eda23771e2427727be2bb01531e59d
font_00_sfnt_off00011042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11042 8000 bytes
SHA-256: 3bb647cf11ca94fd518c08cde25c1ee251bdebb65839f0bd1887509d34c5c1e2
font_01_sfnt_off00012abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CD 29776 bytes
SHA-256: 3cae19a5bbe33962de54bd0ef05f94fb47b1356617019b46e45dea0e24a2f32d
font_04_sfnt_off0001b67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B67B 10272 bytes
SHA-256: 4f33e0415e4b55fd6696e6af388612916f19e3f97ca18e6b034c0845ceba9074

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