Malicious PDF — malware analysis report

Static analysis result for SHA-256 c152564315ee24a8…

MALICIOUS

PDF

104.8 KB Created: 2021-09-16 03:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a7c4357c11d4179307230edb74912e28 SHA-1: 2a998098381e9928e315f37162e7d74fd047c172 SHA-256: c152564315ee24a8224e3e0b6a29db69b8c35fe8b6bcbee221fff1b0616c4c03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/74309083834.pdf In PDF document text
    • https://webmakler.org/userfiles/file/gibukumozapekidijofuxev.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/baluzapaxijikemojamomovaw.pdfIn PDF document text
    • http://agro-partner.com/Image/files/86634266949.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/51367908730.pdfIn PDF document text
    • http://ccadl.com/files/20210905102334.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/fabogurosejifibagorusupak.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/5b073k7nfrpff09m9drbfrkl7o/nikenematububavil.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/e0f3e1a47d4caec7935220e46c3f05e7/lazokibiwudusawavixumis.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/sesakewivowijidez.pdfIn PDF document text
    • https://partnermind.cz/images/files/foxunujozefusejad.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f820982b1f---dugupabab.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/satedovubuvonexa.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/nowemowafobedodepo.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/zevebedowe.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/24009403612.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/jilanulaxubaguvus.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/45884950766.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/25191416522.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137ede976a30---lebatajaji.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/powuvareworurujawekopifav.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/18870144805.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/tojivivunizor.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109052334367344.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/novezurezopumorepi.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-12/20210912205752511031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=power+bi+interview+questions+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_off00013299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13299 19024 bytes
SHA-256: df6581414c4693737358525ae8ba37d4a8d46e64e729b5ea50ca85cb710a5ae4
font_01_sfnt_off0001647b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1647B 10824 bytes
SHA-256: c9dbc344d78d7fdd990326789d57c88359b1966668597bfd04d013430f581bf1
font_02_sfnt_off00017d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1