Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a9bf797ac576f3…

MALICIOUS

PDF

73.3 KB Created: 2021-09-26 04:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8b4463f82b791fc0503834781bb13067 SHA-1: 9a6e1eca40ea04e57a3961638fde82ce7c73cff4 SHA-256: 99a9bf797ac576f3976e8e1f04f56608e88c4b2036ff93a044544710c7721e81
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the overall structure point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://inwebjor.ru/uplcv?utm_term=universal+adb+driver+windows+7+64+bit PDF link annotation
    • http://rakkhunnursinghome.com/user_img/files/63131187578.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/fexopemazewapiju.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/92672388291.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/10032022834.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/wupas.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e1236ad0150c265dc9a70d01202278d6/41783586635.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402d423c1ac---42927945345.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613407ba17a1b---rosaj.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/zifosisowowanowi.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/77845510516.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/98911179889.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/58026234009.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/4i8r9hlh0plmafddmk2bjgpkob/fazekufetazusoxalab.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/84338240606.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/wowil.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090512081773499.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210915_174731.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/442cnefh123e3b3uc9hodq86kb/wurifibebag.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090312332473499.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/46880e3ad6596a0d835d7f6023259445/xedelosewowodoxuxinejusat.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/fuziriveki.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/80746914323.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/fatisukamuruzaxateba.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_off0000b6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FE 17456 bytes
SHA-256: eab46ae357e064cc5b100d3f4b9313ed547c8a32605558ed2a00ca61c69b22a1
font_01_sfnt_off0000e3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF5 10836 bytes
SHA-256: f9535883072c597e546728ab2421c0f856c16db41d98508af7f7392da1425d94

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