Malicious PDF — malware analysis report

Static analysis result for SHA-256 873c4973894d17c7…

MALICIOUS

PDF

92.7 KB Created: 2021-06-29 20:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a18c847a1c3881cbde2259e95b32a594 SHA-1: 7e35976efbbcfd2afb708fb0a86b31a73409af24 SHA-256: 873c4973894d17c71745dd4019c4dfb374154418fc16b84d2d3630160c77cc41
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and multiple heuristics identified the PDF as a link farm hosted on compromised WordPress sites. The embedded URLs point to various domains, many of which are associated with compromised CMS uploads, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://akinmedikal.com/uploads/file/50301232030.pdf In PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acf055ea02---10875596053.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e90b7a8e28---biluzegobevipafa.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27431732618.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/7f9c4d6bda4cfc403620213c5c9598b3/66692431669.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/0ddafb55efef66ba1bb816d222130800/nelolopuk.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e1443ddb1---78609346258.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/pusodetolusid.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/40d7fbae1740b30ea0f7287ae6a334f0/98720488510.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16223482627573.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608aced168cb7---67780689532.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/67683258883.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/donataluzonibexumukunu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6692ebbf9e9faf87301e96497a759189/wemoveziz.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/vajaliveluw.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/dobane.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/3629d64047b60d54ad1cdd97988d1fa4/14195889399.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608623cee7b87---10306747619.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/77304444899.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607434d501e19---feramo.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/46733d16434115a3c76a4c537052924a/67767982166.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/l4ei3fcvjp9q1e89lcatp3uq3q/sejomonuvigabivutagineju.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/b1oi91bpkksfgl6cc7gsh6e7d6/xibawilotuviwetiwin.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/81391462541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=consolidated+statement+of+shareholders+equityPDF 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_off00010336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10336 11008 bytes
SHA-256: 82b52f4f77caf2261c3abbf5542e5641492fa78c620e0a17bdb1fcd5a95104cf
font_01_sfnt_off00011c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6B 17672 bytes
SHA-256: ebe2e65b79cd5d151b81a1be3e2e709248576bef965b0f4ca2252e94e2a6cc36
font_02_sfnt_off00014b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1