Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee232a7b2dcd6c77…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 21:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1837376252e12bc088e289b4a3dbec9b SHA-1: 4d405ddfed20b68d4fcc116ed6dcfd1439563775 SHA-256: ee232a7b2dcd6c776d35dba34f05d40eddc6ceffe37675f3b547aaf0b3e00387
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are identified as link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ehomeforeclosure.org/images/file/31212267638.pdf In PDF document text
    • http://northcity.rs/slike/files/91070796407.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/16949365842.pdfIn PDF document text
    • http://bdnchem.com/upload/files/12243702994.pdfIn PDF document text
    • https://steammining.com/userfiles/file/wuturukukijapanitelujox.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/werixunuwosapisow.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/paderelerelisadilitagux.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/66702233890.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/9c510472094b1aa305c433ca444b53d3/91610113830.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/65012092212.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612edd090d8a8---88462319030.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161317ad16af12---87198230744.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/tetizuvifawokava.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021951312448893.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/6376fd3d8cf78f796694b46c7db01068/sojitugi.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/12379835051.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/35332421091.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/pewinogagudazupefadeka.pdfIn PDF document text
    • http://fullx.net/files/40986394308.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/81bfc22ba8149b2e7444fb79fa0f61e0/lutujilewerokopiwutu.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/57026955695.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109071813139093.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/vepililotaj.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/3080472064.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/55432246491.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090308040154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=scheduler+in+androidPDF 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_off0000ddd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD1 17992 bytes
SHA-256: cf425aa8e62725be187c37f7bf0b288af57261297d67302fbed4d11139ef4864
font_01_sfnt_off00010c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C30 10376 bytes
SHA-256: dd699ab3eaf8f27b673eb78432bc6f86d5d3983e66fe3d3f12196689f4588257
font_02_sfnt_off00012384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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