Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ce7b7e9e807565…

MALICIOUS

PDF

75.7 KB Created: 2021-09-25 06:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cd4e42d40cdb01bd2caee619a23cae0a SHA-1: 01e37bf04aef60d631bdbd61e9a3d8beab4b5a65 SHA-256: 89ce7b7e9e80756564c34502c0e8eda52d37d1e5727efc4c7c2f8eaec5f1eddc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which are hosted on compromised CMS uploads or disposable domains. This suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=how+to+download+text+messages+from+android+phone PDF link annotation
    • http://thanhcongtechtra.com/upload/files/29955954157.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/wukojipuf.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/91461188883.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161433aae9b074---miroserewew.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210918022234.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/lapevilafaju.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/jalifomesewulapedajiri.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/74592167224.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161465c174e4fc---wavefikoz.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b87b62c64---wididabibilokuxozip.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/xesogenugitetagijoj.pdfIn PDF document text
    • https://telorgabus.com/contents/files/14880723253.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/fawiturazagetinaxix.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/44640249760.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-17/20210917112207752364.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/2074763420.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdbeaa73f0---jenosapufa.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/fuwimubagugeduzuvawibiwe.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/90751337045.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/kiwipejisekusebi.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/934d7b108a04da28eadd272c78e1e68c/93787440682.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/11210390731.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_off0000bc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1D 11124 bytes
SHA-256: 16d2830ac59fde61b0419407d298d4ca5109bfb1c6f33e8c654387d96d32c938
font_01_sfnt_off0000d5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AD 19740 bytes
SHA-256: 7026f53b7cc5b023ee852b3790bf3010b824e41f7845b1bd08a608f07338c762
font_02_sfnt_off000108ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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