Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a9fb2de4d5f6d8…

MALICIOUS

PDF

73.9 KB Created: 2021-07-09 08:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 597177f2a3c3884e826fa70228603f47 SHA-1: ad62e61c54180249b8e9cded3f5fac2054507e12 SHA-256: 90a9fb2de4d5f6d82336bb390c8f5931908a25d77d416feb92393e310bbd530c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074468d35d14---51477793615.pdf In PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080818a5bf9c---75652935967.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/vajazetilibuguzizuz.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6237d51bf58f788834840149e75a0325/wesuzipibuxitoponezudeg.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-6/20210506045758437820.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/21122755168.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/043r7rbbeqbjj0kfl71k73ipt7/11822538612.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f3717eedd---26438743036.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/gubizisekakudukimeso.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887d3b44db4---25994159416.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8f2bb3b1f---79517965695.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/rb1qsah3k8dqiojovn87e14lco/25234468501.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4e39448cf---84731540259.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b23bf8eb02---wizaxotewuweloxavaxivuwa.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/86860177034.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/37f665d6adb6ab1092cc774c851528b5/17878618627.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/22795348702.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/2105ff4d0ed71800c85a87c7947d6348/66879230454.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5444e23fb---zimofapep.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/gajifatugaketetudosudariz.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160717c1ca52f5---paduvij.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/fimonawazamuvavirud.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa89cfdc07c---senavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=mad+by+sarz+mp3PDF 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_off0000bdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD608 10440 bytes
SHA-256: 961bf5c58ee25db1dc01baa3ca038fbafecde6fd100cf2ae96f707914e9c7795
font_02_sfnt_off0000ed84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED84 16828 bytes
SHA-256: 7ee234c051e8216d011714cb76e98468c26cfae7c3d3f03a18197bc1033cdd7e

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