Malicious PDF — malware analysis report

Static analysis result for SHA-256 431671a8cb3ed2e1…

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 08:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1e5ae766f028292117b75db776717373 SHA-1: ab4be0f19b0032f73a688db19ba20f18676d8384 SHA-256: 431671a8cb3ed2e109515037c856403b81b193b8f33b62ca18b972ee47cb07cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a malicious PDF detected by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. These elements suggest the PDF is intended to redirect users to malicious websites, likely for phishing or to download further malware. The embedded JavaScript is likely used to facilitate this redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://medvor.ru/uplcv?utm_term=truy%E1%BB%87n+ki%E1%BB%81u+ch%C3%BA+gi%E1%BA%A3i+1953+pdf PDF link annotation
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b0c71c612---50008043379.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jotimitular.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/17643185110.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/bulesogavexizafesuvatef.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/pigiladalex.pdfIn PDF document text
    • http://jogamiskolc.hu/ckfinder/userfiles/files/regujofebifowizoz.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/31832899605.pdfIn PDF document text
    • https://lod.la/images/news/file/rusixa.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/detiv.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/vuxezolawuvase.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609441064a4f9---39695361028.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f071192fe0---71854108496.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/52181543055.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/sinawesefaj.pdfIn PDF document text
    • http://medrea.ru/upload/files/losateda.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/61376809198.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf5711ebd3---walagirutususer.pdfIn PDF document text
    • http://gptools.net/userfiles/file/46544403459.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce1322874e---38840381373.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/2829075139.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/potakemepituvatuwofo.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/43302395873.pdfIn PDF document text
    • http://xycrusher.com/d/files/77713024702.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/ca38e27c62144aa2a2624d12a2b39b8d/mifazemefejerevejo.pdfIn PDF document text
    • http://citra.cl/userfiles/file/pirufirerasajikogokibo.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f3b71660ecec8df5cc65e82f1251af98/28730221078.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_off0000d2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC3 11704 bytes
SHA-256: a30f31d31ff1205ccaa7cf54ff21b4c598e6cdae909cd1f1b5bf6be58fe5cfc2
font_02_sfnt_off00010605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10605 28044 bytes
SHA-256: 1806f5774b03b7c32b6638342c6258110fcbf483f54ae457515efe083846965e

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