Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd9e9a32fbeb96d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 11:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 076ca238472915d992928806251591fb SHA-1: 279a75439df72f1dbfa932e71614bfbe29f43a9f SHA-256: bdd9e9a32fbeb96d683d2ebd45c63e3b9582a087b2e1c16cbe31540fa1ebe90f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The primary function appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=condensing+vs+non+condensing+water+heater PDF link annotation
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608094a5df9dd---xojutalunanikowuz.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/konetojijolitevuw.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/zijenibefuvapujariko.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/kumarozoxisuwole.pdfIn PDF document text
    • https://aashianarealty.com/file/59019619754.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/nujatikam.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/71700370662.pdfIn PDF document text
    • https://airshow-bg.com/file/ravafulu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/7de95ec75788dff72a55c8c1ade80414/doziratagav.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdc36e4671---lanesit.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/51604132842.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/zibazati.pdfIn PDF document text
    • http://dztechfin.com/upload/file///kerugofanof.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/bejake.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/33998824828.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/mokujuvafamuvigakupud.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/fodikexalosisenol.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/40fhk0g31qbgeu47ehvb8eqddq/62857956807.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210602173538.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4ba4962d1---jesewavilasedowagafeliwi.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/125863764.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/torovomudexazefogarub.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/xapesosijemiserif.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_off0000dccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCD 17684 bytes
SHA-256: 5d3e31225b47ca61fdde048b0e00e53a2ef4686907198d995523af0f7d0ebe04
font_01_sfnt_off00010a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A0 10784 bytes
SHA-256: dc139a78c2c5fdc64d94dc712fedd4bce231a3515484cc7cbf50b62d82ef3b40

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