Malicious PDF — malware analysis report

Static analysis result for SHA-256 53156e1da5e55675…

MALICIOUS

PDF

75.7 KB Created: 2021-09-04 18:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 76827b331845351b1b116d2d699edac1 SHA-1: b6a09d743d4afe832f6423b3759237be73c481a4 SHA-256: 53156e1da5e55675f29ce215d98a88cd80135f0eed63467ab56731cf8dc85fbf
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Several heuristics indicate the PDF contains a link farm pointing to potentially compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs are likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://klaaswester.nl/img/file/posatazagomirojujovik.pdf In PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/worevatenorisomi.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/xunatulupevovebej.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/bemozekinem.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/10907022557.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e1346e82e---zisajusadazinizofiji.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/33294947947.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/89436191079.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/64283319686.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/34411138270.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8f44c11892---vuzevu.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16078487b5d5f0---kejejanoguzigopabogojofu.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad05256b67---39158251152.pdfIn PDF document text
    • https://aeap.com.br/ckfinder/userfiles/files/22795903499.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/dovinakemotupudojiw.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/bazelajetenipuzig.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/94023131497.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/750895ed3a0c99713c9b7d89cbae270e/rukosanakig.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/rewixubusitubejiz.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210828080714.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210511081057.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/puziravukin.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/44352877439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=constitution+act+of+canada+pdfPDF 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_off0000c4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DB 10468 bytes
SHA-256: d54747084b220ee3a8436221b222fe8b7e93374a592614c9ba2c3bf29a8f5cc4
font_01_sfnt_off0000dcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E2 17024 bytes
SHA-256: c1521a6e5ff0303e291fe069b2fff51459f82dccc429f61ef1436c8aaf49a543

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