Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a5da746ed9825b…

MALICIOUS

PDF

79.0 KB Created: 2021-09-05 19:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 063c07c7a69efb13f5f15b73da097fbc SHA-1: c9d5f4e10b584539cc05a2cd1878f76a9556ca87 SHA-256: e5a5da746ed9825b3535839bd8dbea480bc3408142c33e8aa881dc78043df5f3
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs. Several heuristics indicate the PDF is a link farm, with some links pointing to compromised CMS uploads and disposable hosting. The presence of these links suggests an attempt to direct users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://parfumland.sk/upl/44939460680.pdf In PDF document text
    • http://becucci.it/userfiles/files/mobuzuwutofumo.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/865n0ncirjccj8i5kpaqs1uvgn/73933797777.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/15635880898.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/15098707038.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/tuzokawobetirup.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/fomubipugo.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/30f0d188edc68ac4470d44aa01de9223/32436801645.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/20219333626.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7ff0e933e---rakav.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160913b09d1518---pekumikuzimojelubu.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/dibikujoz.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/buguxeput.pdfIn PDF document text
    • http://cudicio.it/images/file/koxuguj.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/16128904433.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd0c8abaa3---73219386473.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/riruxajidajek.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/d031f745b4ae3e90743fa74cc24feaf1/56061476606.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/aj3jmfsluutclhodjm8uud3hms/26451779705.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/22239750632.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/63919205331.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/tuzojanodo.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/64dcc38c073fb32cbd3ac875bb6c4ae9/53524316089.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dbc359b21---punabijonemerorodadasexax.pdfIn PDF document text
    • https://agermag.ro/mm/file/tetazubiwopovugigeju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=wisdom+teeth+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_off0000d2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BF 17208 bytes
SHA-256: 2e1be5b8111661831a820d202b6fa02fa3d48d660128cc106790b96302807be7
font_01_sfnt_off0000ff78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF78 10344 bytes
SHA-256: af84ab2c6fe700a060275cfcc85866b03f7e0262c037ce4591c0bd5e9697eb10
font_02_sfnt_off000116d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1