Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52db9635011515f…

MALICIOUS

PDF

84.4 KB Created: 2021-06-29 03:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 14dd8a18e20ffef4263a6c993c447ac8 SHA-1: 7953a28679979874566832aed72c809b95b7b5e4 SHA-256: b52db9635011515f244db4a3b457bfa7635da9f3869da308b9ec38d9b2817e2c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://promise-land.com/upload/file/4577162121.pdf In PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607580810eef5---nuwumafuman.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/lbh8pe704cf6ha4cul3qko1nck/jajuvixovibuwere.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/22126408744.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/48929923561.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/78436499681.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/0d0tqvan2dpav1fq95q9006l25/bosanebalodiza.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/tobanejajujiru.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4984e47932---mubizekenawiguza.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3022ea757---menakebe.pdfIn PDF document text
    • http://vienhung.com/webroot/img/files/70196389613.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/1128423175.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/28441367612.pdfIn PDF document text
    • http://dejede.com/userfiles/file/50320314560.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/17619363766.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-14/20210614205814189907.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788a6ed51c3---55451416231.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/30369628396.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/50204210776.pdfIn PDF document text
    • http://chinalabware.es/d/files/nogirajuvevajowezotu.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/1e78aa1900c6b468831a38a74066a06e/depowiwuvoputigipupob.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/57820110203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=topology+in+mathematics+with+examplesPDF 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_off0000e7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 10984 bytes
SHA-256: 7c8111d2a253cdcde20a9768e83968263f645d62326b61710d055da831443f42
font_02_sfnt_off00011948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11948 16472 bytes
SHA-256: 5c1d59e130c8c9c9fc4d9a6b800a2f26ad6fa787fa2083d97f0b8a068a99aa72

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