Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc6d15b402f6cdd…

MALICIOUS

PDF

101.3 KB Created: 2021-09-23 01:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4bed28cff4588676ec953fb34d9ef65b SHA-1: 668a4c110d535d3730d9b5d29615db4bcdc472f6 SHA-256: abc6d15b402f6cdddb8c1119c7795b18eedb9d2a02086ba450bd628c68f3eae9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially harmful websites, possibly for phishing or malware distribution, leveraging the PDF format as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://cructi.ru/uplcv?utm_term=geotechnical+engineering+short+notes PDF link annotation
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8583206fc464bdfe62d75d7350861af5/59045984332.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021091322541837.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/xaxafavavepinitolirakesuw.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/91957166061.pdfIn PDF document text
    • https://wildnaturetravel.com/File/zugerel.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/42090653594.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/wudajibipitexula.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417a316992b---52023521177.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/10725904711.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/xiluxarezol.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/28515830461.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210920_D5AF77AA7DA1F3F6.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/50349136952.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebb8baac4e---vedupepuwuvana.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/karamopuzijuvapisi.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/kekuxeburalaboboruzig.pdfIn PDF document text
    • http://cartopack.be/Images/file/74636306614.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/171567559.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/rokawumol.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a694c2d907---59578256746.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/14788166610.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/nuejl3nnpav9chevp5b531cmi6/takekekixudeze.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/94495467306.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_off0001291c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001412e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412E 17732 bytes
SHA-256: 01c5dddc03efa28ba1fd73b653a15f74a10f9d58b32bfa9630001e7e3b14f0f1
font_02_sfnt_off00016f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F7A 10548 bytes
SHA-256: 21aa29427d70f1efa54eb38e28ba3f59ac44d880b8318ad6d2672f4d84efa871

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