Malicious PDF — malware analysis report

Static analysis result for SHA-256 7feb22a62429eb52…

MALICIOUS

PDF

86.2 KB Created: 2021-06-14 07:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1ed358193ebf0c5ae5fd1164d1333c41 SHA-1: 19be08f276f949550dcc812097983d3bc1bc526d SHA-256: 7feb22a62429eb52fff8d6badde2228e766a188623e00497bfb271cc882de1fd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of multiple external URIs and the overall structure point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://smidgel.ru/uplcv?utm_term=baal+veer+returns+ep+106 PDF link annotation
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/wimeziwaxofuguzag.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/funokunodajosexiwo.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/fifipiwelana.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210518/file/16213233072288.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/994a2409d9088c8bd36f7741492bbfdd/xotawebajumojumusi.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607075d24d69f---maliretedepegukifomisoz.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16086628b461d8---gevasola.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16072391250290---lurogaxat.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/11375612463.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608372451cc54---70088927076.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c785000cc---78411800993.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/43950808607.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/cdv27hjhtrnbnj4785b09tf477/magilinabirabukebebulan.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/17141843892.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/58010214094ec3bb4d83c39e59a140f4/kugekewemix.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/01343b3393581eeea21f22086d8ce446/47722379054.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE857 4996 bytes
SHA-256: 84fc4671ff24e40f6e255d46c6a571213f268deec02e176c25a52200feb289b1
font_01_sfnt_off0000f959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF959 2328 bytes
SHA-256: 9808af6c36a7dcb1f5dc15af9f393fa0504dc28b9dc1df43016a2f3e5d5668dc
font_02_sfnt_off000103cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CF 10352 bytes
SHA-256: 1da343aa7777501cd831f333efabff93f8302653040582241fe61ceacdf896a8
font_03_sfnt_off00012775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12775 16140 bytes
SHA-256: 00468df452218f546d59995a7cf9b4297092e2fd476dbd2f6ce79846bd051107
font_04_sfnt_off00013c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C71 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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