Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa594b500ea8051a…

MALICIOUS

PDF

78.9 KB Created: 2021-09-23 15:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6dee9a6a009a90a17286fee988b56f9e SHA-1: cee1e84b4c01d4ef567a29bcbbc75ecfcff8c461 SHA-256: aa594b500ea8051acb5f555156c6a5e90c720b69978e48d2c24f419b206442d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pixomot.ru/uplcv?utm_term=gobiz+app+download PDF link annotation
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1614a30b53984c---85665120591.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/makuruf.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/notesemoxozavuxu.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-10-08-47-25-98.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/jodiwinap.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/76689240192.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/19866652219.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/11906145536.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614c45fe21606---14630255356.pdfIn PDF document text
    • http://midospa.com/upload/files/dozexepezaze.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/1bc1ddb2de4e3891dc1e0e79100de418/mejixurexokifufudemom.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/wutugavigejamusoki.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210905040501.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/1099333736.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/detere.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/maluvago.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/69232813824.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109210236257853.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/nupapututejamipemimo.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/nujetidawukiragopobif.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_off0000d007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE819 18348 bytes
SHA-256: 0a335503d4160d16bec2e7410e62cfc40dee5f8d160e89827b71df9d719b5627
font_02_sfnt_off00011761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11761 10212 bytes
SHA-256: d1b94e7cc234eb55a31c4c42101913db5c01579d41d87b29ef3bd548785f429c