Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b663dbf1742ab0…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 17:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 40d22eb2eca14fbcd30777041a7f398e SHA-1: 6e52a413b6d2c686784fc91d2e4babf8a0c43cab SHA-256: 33b663dbf1742ab06a7bf6eb8ba2e2fbd326ec282f91624f8c8123fae40f0ad2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to the download of further malicious content, such as additional malware or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/257b39e1816884013db0323074f9a6dd/xewedawolaxuvogikukos.pdf In PDF document text
    • http://gapoom.com/upload/fckeditor/file/josafuzafajijadomep.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/a3228c4183b1e42013b61f1b604c6569/26315237622.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/zupujeteraf.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee5aa1a3fb---berexupabapevomoxibodor.pdfIn PDF document text
    • http://simonide.org/userfiles/file/lamugedo.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/16501100614.pdfIn PDF document text
    • http://apvn.info/userfiles/file/saxabutamaxas.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c518aafd---lamaxagixamumavupajoxanu.pdfIn PDF document text
    • http://come2menorca.com/images/file/22320547299.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4eaf5cd3e---wexaxagirovuvote.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202191182551497.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/wesodakararififamorap.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210823165804.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b266e0bd7f0---tukodakorofadew.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/limor.pdfIn PDF document text
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/13450828076.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/31f6a925f128262e70a6d489338d439c/43753254969.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16128f0f9de099---moxaguxez.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/77699195784.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210621_165446.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a6bcea566---81955418108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=iframe+blob+url+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_off0000d7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D1 10388 bytes
SHA-256: cb78c8989b6c8889d0fb858b151935297cd7a04ff419c432ee96661a0d544e2b
font_01_sfnt_off0000ef15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10727 18920 bytes
SHA-256: a6d290d7b2235f8ea7c98c049173d15817f9544cfc509858e841b309f022f014

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