Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c29533b4e8a6ea…

MALICIOUS

PDF

75.4 KB Created: 2021-08-30 16:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3495315c09eae2751ac4220b24342cbe SHA-1: de2782f8dab285e90a4234ad818ef0fb19a3a0e2 SHA-256: 62c29533b4e8a6eaa76c103607763782d9f9594407bccf526be2c62ee790e72c
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary attack pattern involves using these links to deliver a secondary payload or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://trunglam.vn/uploads/userfiles/file/metosewovebitosuv.pdf In PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/15599458270.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/015a55b5f38405979db190e0cb272754/83264027628.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e9ef91324---fekixapilekifaraxawow.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/timozifeg.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/fomivemazumorop.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/50456791910.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/9761505076.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/dfd0a4af803da7f8fecdb86799003e26/52360139397.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/5jquqr9cdtgqne5br0tfadft86/tevofemolorudewebawibiro.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/69601587462.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/32435923888.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff5a13c50a---90209730579.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/kinedekarutabatuna.pdfIn PDF document text
    • http://fitviewer.info/files/file/zolagijapeguwegudo.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/ejq6nghma8pi3i6siqok6f3175/baxapojuganenubugefa.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/27179043184.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/fokavunamajax.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/28363629064.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/puzemonatibukovawoker.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/jezuvelaki.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b169d01a50e75a741fab53824efb4336/28637477286.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/48224928324.pdfIn PDF document text
    • http://rcot.by/pics/files/gugajix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=when+the+last+sword+is+drawn+onlinePDF 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_off0000bfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC9 10424 bytes
SHA-256: f3410edc424a693f3cfee0af302a235dc9c3e17d7b1c756c03e46a366be61ccb
font_01_sfnt_off0000d769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 18924 bytes
SHA-256: bd2c0d703d3a8c7238e0162216e52ac126e11f8c87e5747b8fc5738673ce1d16

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