Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee7f26732d280dd7…

MALICIOUS

PDF

78.9 KB Created: 2021-09-15 14:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2ea4eb029308c1b75ffd5e4c895e0ae5 SHA-1: 1bc98202c676c94640bf90e13f39970cc81a3f65 SHA-256: ee7f26732d280dd7fb994d364832fb5ed700010aad6f4acc1d7a07784d221d93
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to potentially harmful external sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://hophamthaibinh.com/upload/files/15508733829.pdf In PDF document text
    • http://wwm-quanta.com/upload/files/xulusunavulikalawa.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/totasefawedeje.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613372ef20023---76339609013.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7820232b8---boxoximetilu.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/6492106272.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/xotibisidumafik.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ada3c4a0b83c7ac0dc090aabe4bb641b/tevolimasabaditalivafolo.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/topuzeses.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613114196c022---88779523618.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///migelogukeno.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/63988187766.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/varegubomefuvi.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/28568060258.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300b6ec4c0e---87250989292.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/kulurugoxivemuzo.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///3324857924.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327e8135417---69426848442.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/3701691156.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/86066274049.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/89915864140.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613844bf41243---53382050895.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/28233377246.pdfIn PDF document text
    • http://vinmexindia.com/uploads/dupamikegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+hub+bgsPDF 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_off0000d2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F4 17636 bytes
SHA-256: 34199d15ab4902c529a0856ad2856ea50af9096564d851cd846e0b68f97c1269
font_01_sfnt_off000100b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CA 9868 bytes
SHA-256: 4dddacee05127f87d0eddc3cede43290d6f11d58f1c569c7d876a668963f6df6