Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f7d072691fa761…

MALICIOUS

PDF

89.6 KB Created: 2021-09-18 18:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a5e3d11c587cfea60cd8d7c172be5099 SHA-1: 7912be25033352f5e9dec596db9bbc334127ebf0 SHA-256: 93f7d072691fa76144500beff6569caab89e61a090f9073788d62107e5012da4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were directly extracted, the structure and URL patterns are indicative of a phishing or malware delivery mechanism, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/fekuzujetibesefunibas.pdf In PDF document text
    • http://timebymtm.com/upload/files/vosukidekus.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210904070441243.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/palaj.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1630861209.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/lojuzasukinudufagekis.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/sujifabewot.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/zuvejep.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/44763828653.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/88203115589.pdfIn PDF document text
    • http://lamay.de/userfiles/file/putedexel.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d06432778---debuvikerokogadazomurobe.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/najevatusapopena.pdfIn PDF document text
    • http://artbaget.net/admin/ckfinder/userfiles/files/1602441021.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/c85d192a242a5bbd2b66c35c7cbb3fe4/bowiwixoladamumog.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/wokunibogusogabelenelozir.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/93691238327.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/99891207569.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/69753093492.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/68408420098.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/niborimogabepivezasix.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/654eee1789dfd2f256a509f4e9e2e192/siforanudidadaj.pdfIn PDF document text
    • http://preiss.at/upload_files/files/6942913445.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613304f7669e3.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/fojiteriwuwe.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/tanolisarogokonemeribi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=load+karne+ka+appPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB99 21532 bytes
SHA-256: 8e0a020bbfbbc7e20182873c34294b7a9ba3c9da4cb1eca8630f8298c0865824
font_01_sfnt_off0001143c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143C 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5
font_02_sfnt_off00012a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A20 10028 bytes
SHA-256: 1fa0406a41f0fb1e0c5f9ac6ee2045e10039723718c689069837ea546eff11d5
font_03_sfnt_off00014070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1