Malicious PDF — malware analysis report

Static analysis result for SHA-256 0439e30b9114d211…

MALICIOUS

PDF

75.5 KB Created: 2021-09-02 06:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 216d3c6c71377b9a45588eaeb5b7b8ff SHA-1: f569035ab843bb36085e5dd01d635f48aa90fcf0 SHA-256: 0439e30b9114d2117c9abc9ef981cc6023a3b0efa6bbb0809369534ac1662284
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing or malware distribution lure. It contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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 https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078aa1ecdfa2---12440436912.pdf In PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210804_069140E2A84F674E.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086064ab95af---94156789755.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/74683976309.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/95138298848.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e413774486---42173888967.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4e005e749---gamumimizutosixapirumejuf.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/bumemipidig.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/67011138742.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/61658387090.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/takupe.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/vubamuzefafavifani.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/g0qecdt04q9nvfb4vqr0jasldk/tawunudaleworurukin.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/batokoxudoliboxigog.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/borodikexoxexox.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/24231759994.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f720beaff9---16035608674.pdfIn PDF document text
    • https://airbays.com/userfiles/file/80963620796.pdfIn PDF document text
    • https://kueapem.com/contents//files/51514462434.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775ca852f3a---9687749945.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/1c52b6d6f5b383635fbeb467d0941d9a/94042751824.pdfIn PDF document text
    • http://cooleywestbrook.com/clients/865832/File/rivibazusu.pdfIn PDF document text
    • http://darec.sk/files/files/zepozoragurilesadasudosu.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/takewabejikapak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=beacon+theater+sumter+sc+hoursPDF 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_off0000c3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FC 10512 bytes
SHA-256: 5f6cd4583eb7a38d5b6837d88fbdb4275729b3b7298540c83e09eee4ede80d8c
font_01_sfnt_off0000dbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D5 17048 bytes
SHA-256: 4203782423e528f47352eeb7c266cd4a10f06a96c9f9b5f0bb7c01eac9fe44c5

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