Malicious PDF — malware analysis report

Static analysis result for SHA-256 261c1944a2126d55…

MALICIOUS

PDF

90.7 KB Created: 2021-07-16 20:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8ca0b453d26ac3bd61a92b044c5f15c8 SHA-1: 96db1151f1003f143d0d7c37ee262096532fa92e SHA-256: 261c1944a2126d557a5c9ddff40232d8f557d0e65d7e02619c962f61f959c228
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://onlinetradeshow.ir/uploads/files/78717213254.pdf In PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/zapelakinisuxofo.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073afa04e9a3---kekuralorer.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608447054d3dd---43533505785.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160839d5a0d98f---metuwukogomoduvusukudiw.pdfIn PDF document text
    • http://indel.sk/userfiles/file/rupavekil.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/cub47tbusd6likek8l92np5uqv/79585435257.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/waveje.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/921a5b4049fe8750d9c33d6c72862026/45118966726.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb4c2c17fa---69877371277.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/60436762567.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/lowotirumemo.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071380aae8ef---15664047757.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/kinisaradeduje.pdfIn PDF document text
    • http://annabarons.lv/files/files/99235132617.pdfIn PDF document text
    • http://drive4smilesquebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/35393793610.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/6261i2j775csddrpuucu87smgj/gijizi.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca06dae566d---66964352209.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/fozanijebokulojigajuda.pdfIn PDF document text
    • http://kfbi.ru/content/file/legijepu.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/81285854760.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ufg5cj2qlbo5v7d94aj5cf6fl7/26492323495.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/fazuzotofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=iq+shapes+test+with+answers+pdfPDF 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_off00010030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 17580 bytes
SHA-256: 31c6a5d96ee2120ca5ed0488ce32a79dbaf4a985fac9f69bb0e5aea3d08cc9ee
font_01_sfnt_off00012e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E60 10612 bytes
SHA-256: 50e25f67809c3f3b6f1a5497a6f3f53f25be8e0ef44ae65efccdd460c28bdc5c
font_02_sfnt_off0001466c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1466C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1