Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87cc8c9ed9603db…

MALICIOUS

PDF

73.5 KB Created: 2021-08-07 16:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 076701718fd9ceea43c50c31c177c4c7 SHA-1: 5f7ccab38dfe44a2f450fbb730c3588362150855 SHA-256: d87cc8c9ed9603db4a8b59f169d3c76077d54f9f1bd3fc88f93ef0cf9a02dde0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated maliciousness. Heuristics identified it as a link farm pointing to multiple potentially compromised WordPress upload directories and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest an intent to lure users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6590

Heuristics 5

  • 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
  • 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://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/etkfeed358s9tlcname3jhrt42/karas.pdf In PDF document text
    • http://nietegeleuve.nl/cms/files/tudivolakerimipefawedogu.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/zuwosuguw.pdfIn PDF document text
    • http://vienhung.com/webroot/img/files/kidadobisewemi.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0b22dc2c5---nubesagorakizizurugumizi.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/82406790446.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/farev.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/2b153875a5553ab1c8e997cb0b96f191/226590436.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/jipibapi.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021070720103242.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/nisozukur.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ggkqac7ud78vfhg8je4nufngj6/bajufuparajopedafanipule.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/17954480519.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/37114762808.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/4c925ebc8eb881c46c447c4e933bd2a8/gedazimolux.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16097496fedf9a---gifikegusujuxesotawedo.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608df8b94049a---javubesesulowulolodekiwu.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/leraverevexozog.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/xusolexumepoxaxe.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8d2f2966be6c7497800c12073c2a0a1f/movagakazo.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/fesowexojogojidodinato.pdfIn PDF document text
    • https://airshow-bg.com/file/39677795722.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947ba6571ef---76338412836.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/370313958.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/rolete.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/ca38e27c62144aa2a2624d12a2b39b8d/mifazemefejerevejo.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e24429746c404365f14579d004e0aaa3/xojibagad.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/7f4acm7q28hagch4jrtsd3efv5/dofosaburawelutabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=smith+and+wesson+32+long+revolver+serial+number+lookupPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 17904 bytes
SHA-256: bb0d9f00961149a35c02331242b4c06d60425c243863469050d42a1028449a79