Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2c8650dce2d374…

MALICIOUS

PDF

70.7 KB Created: 2021-09-16 10:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a223dcb4732db034d8973f2b928f0472 SHA-1: feb32835035c251fb58b8535c9845df5c17efa98 SHA-256: 2c2c8650dce2d374b564060e7f894af9d2f5ddb088abb16b4592d52ab12568c7
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external websites, with several hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, so the primary attack vector appears to be the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://beerskiboot.de/img/upload/file/lenazovodabataje.pdf In PDF document text
    • http://anshan56.cn/userfiles/file/1631085411680653487.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f195b4c39d---9642622219.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/mobusokekasa.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140664a571b6---67622091060.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/wodowujigusite.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/vowujiwenox.pdfIn PDF document text
    • https://onecre.com/images/content/files/58837926097.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614058b700c13---48527104372.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210908201905.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/nizizuwejo.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/7198833683.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/wurujen.pdfIn PDF document text
    • http://ukrfirework.com/images/file/41176672134.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137ee4a9d409---95195801904.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/33903443210.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/xugemifugigek.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/gepogawovimu.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/34153604357.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/b47ce24f64b2c7407b8ebfa86982f84d/zotewelatariremexugoramam.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90322527033.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/jelaxozovozaso.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/xorazapukelosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=movies+hd+latest+versionPDF 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_off0000b6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A7 10404 bytes
SHA-256: 5c8b4802d7649a4311549bbd63ea6d3b41a783c6f03851cf87c75d04bd7574d6
font_01_sfnt_off0000ce2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2D 15532 bytes
SHA-256: f0f90b140632eda99465f3022757cd5c92daa3636fa3eddab3c3922ce23fe51e
font_02_sfnt_off0000f58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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