Malicious PDF — malware analysis report

Static analysis result for SHA-256 810ea69ddf46c403…

MALICIOUS

PDF

75.7 KB Created: 2021-09-12 07:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d9dbc6317f4ebb9c6a11520f21be799b SHA-1: 435f20d0c1bec25170d3a811f33b0ab1795994fa SHA-256: 810ea69ddf46c403a2dd9be9e8c7c44eb18d4a11c88655dcdcb18c52d6721f78
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL heuristics point towards an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://garglob.ru/uplcv?utm_term=ef+schumacher+small+is+beautiful+pdf PDF link annotation
    • http://rootbeadmill.com/upload_fck/file/2021-9-8/20210908064731250408.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/kilafelixiva.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/pewogowebamofewufob.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/wozositigokanu.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/dotifavil.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/posemekejirivipone.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/tasikivixiva.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa46fc9fbf---rewapuk.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134614d23841---77646928079.pdfIn PDF document text
    • https://rosycaffe.com/file/10151036471.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/wipel.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/92368904923.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///gekijizexuxorifo.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/vimovok.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/nowuzomatejelibefozu.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/70020345516.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/747h8sc1fd6q2t3i2um4hduq8f/13280045588.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f9403875---pujaxobafaxibalulufebe.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/monuguwezugubenovug.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/xuxazipetotonadok.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/vefogaxexek.pdfIn PDF document text
    • http://balone.net/_upload/file///57729387135.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/93704351223.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/4296414845.pdfIn 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://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_off0000c2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEA 10884 bytes
SHA-256: b1bb236774cd65ce498d38c072ccac3cd7f82432e05bdf1c685e53a05388a1c8
font_02_sfnt_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 17516 bytes
SHA-256: 880314045d3e54c4637a54df169114c4e14912154688161140d94dc7172256c1

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