Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4d80b92cb3e0fb…

MALICIOUS

PDF

89.8 KB Created: 2021-05-20 06:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ae2c04aea2b188e2d0c53db4e1954fe2 SHA-1: 053df57ee138bfe3da9699e0a924cab574413d0c SHA-256: af4d80b92cb3e0fbf0c822ca52c705c712eebf7ba5f0f157e90efe94e4a8bf7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with a spearphishing attachment used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/uplcv?utm_term=ejemplo+de+justificacion+de+un+proyecto+de+investigacion+educativo+pdf PDF link annotation
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccd51d0d1a---mumonusax.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085bc233ba0a---19116612685.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/1024af4bc97a40715d5c411f2e265f38/devivusejuxab.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/koralejivato.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04a6404cb2---duxetodumomutubulesupewij.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/h4e0i3dvrnd5cnedetjjnbvo20/poxovepona.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/5cf98e5baf1265e315f7f392116bfd4d/zisut.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0216534c68688f68a71409c0da4bc89d/16831487187.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/38608682233.pdfIn PDF document text
    • http://www.bandungmesin.com/file/direjifowoxetoj.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609c43103b944---zezevutigekaruzafoxozu.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089510f2a18b---gafepeni.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cf0d94238---gowusubexu.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a40a252196f---gajivekivodunipedin.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/d52frbegmfv92cdoiau4nk7gh1/66245170660.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea3a4450c0---pekibukogatonamobedaligen.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a30399f1118---89424501324.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609869673d016---2197355207.pdfIn PDF document text
    • http://www.asslar.de/downloads/67438225719.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/widirevupolemo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E72 5668 bytes
SHA-256: 1dcc05194ec0a0a48c4935feb6ac4466fc37e3aa50f50e0848b10f2a8784caca
font_01_sfnt_off000131c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C2 12192 bytes
SHA-256: 20a8800041d83d3032fb522088bec043fdb4e3782c6e9ec8ee088fff4e459b5b

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