Malicious PDF — malware analysis report

Static analysis result for SHA-256 f48a7e377f373fd4…

MALICIOUS

PDF

83.9 KB Created: 2021-09-23 05:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 52eb092abdbd7931309d716c7c5a287a SHA-1: ecaeddb3eab40bd700f40b13e2845478c7382d9a SHA-256: f48a7e377f373fd498496596a17d0c65302b2168f2c59dc92edfc8e8e87a50af
96 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple compromised websites, suggesting an attempt to distribute malicious files or redirect users to phishing sites. The ML classifier strongly indicated maliciousness, and the presence of numerous links on disposable or compromised hosting reinforces this assessment. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e752900ac6---rupebudanibe.pdf In PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/7703953370.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/xipulojewap.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133ddc131d14---japadakibususatiwidut.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/87160536587.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/74895438816.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/23052626348.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/39147498017.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/pawipevowasewiwinar.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613693db39204---8475955134.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/pemuja.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/80861141470.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/17488822063.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/xosuxiluvutepofuvogaxuto.pdfIn PDF document text
    • http://adveotec.com/img/file/gasaferetaxunora.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f190657fa---rovofizufa.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/44972302753.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/79736986751.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/43686800403.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/cfd9ff6d6b8d393010a06af26eed20c0/refofifibovosazofodekigu.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/jexupimubugalimoki.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/fodetaw.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/72558308958.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/sizisaludewixakuxivivi.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/79299963576.pdfIn PDF document text
    • http://soles2walk.com/data/file/16456366499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=beauty+plus+free+apk+downloadPDF 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_off0000e09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09A 10844 bytes
SHA-256: 0f375d0fdfd4e967f52aabc7653e74642e28656b1e92b5167e30ff3a1ea9ca80
font_01_sfnt_off0000f9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E4 18336 bytes
SHA-256: 9c9dc6204a9cf90a8ef1dbc587dc0754573eab1f91e632771be51e663776cf77
font_02_sfnt_off000129b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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