Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63173787c439638…

MALICIOUS

PDF

90.3 KB Created: 2021-06-27 11:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5fc6191baa51893d92f7ef39ac64a931 SHA-1: 47346fd0521342eef2b084cd278479d91e8eb305 SHA-256: a63173787c439638ee1cc772593ee0449218c15d6949dd7c20c621d86be0c673
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external files hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e2c18137f---duvur.pdf In PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072247686f68---89396796938.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/79362045312.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c36d384ac19---wawinasakegirasuxow.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a148618ca08---jalubepawuvorazim.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef7d565507---jevawez.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/98380720469.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb1276c4ab---xugipokomufufikob.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/41945548835.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/b2c2efd984678e6c1b5a521c670e4da7/mugik.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/5827090e56f363db39e6c7fd5ca2baf2/10027653040.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/36d3fcfa8fea015a4bba177779a4c503/30693377405.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/31466eb6cdd0aa6b230db8a5359c9cba/nalamamobipibumuvasozoxo.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a1532737041---77993479582.pdfIn PDF document text
    • http://moon-villa123.com/CKEdit/upload/files/66576931645.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/wabesojesinipetukazinapa.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/e9f2f923e591662b26e6acf05671b35a/65324139079.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/tadudefigimomipejumo.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/gomujutukugomunuwifoz.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/67128414979.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/996da89ed1848a45bd50a953799ceb60/niwixagoja.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/32617610680.pdfIn PDF document text
    • http://adveotec.com/img/file/divaduwokel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=class+8+geography+chapter+1+questions+and+answersPDF 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_off0000fc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11444 11528 bytes
SHA-256: 5d6bb5daac3f272766b1f3d55e74789111d6bc6bf7ca448bd7a946efb0d8a5ae
font_02_sfnt_off00012f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F28 17176 bytes
SHA-256: 22402736b60db0e990038f7776079d1f76a249858dfafae68ab832c23cf9f76e