Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5589ffb84ad4900…

MALICIOUS

PDF

103.9 KB Created: 2021-06-26 00:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7cc37c3c6cbb55c73c8fdfae82d9d97 SHA-1: dfbf29ec4ad0faa05edee1b39f72922b06e4136e SHA-256: d5589ffb84ad49003779de6f8327b88217e7961c9cbc02f313c52f36647cf2a2
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories. These links are likely intended to lure users into downloading further malicious content or visiting phishing pages. The ML classifier strongly indicated maliciousness, supporting the assessment of a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://dok-vo.ru/userfiles/file/48674777909.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add68571200---duwepuzaladusozifike.pdf
    • https://elnativocoffee.com/silver/upload/files/lenuwexaxedobiteteluru.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16081335fbdb3e---panigunewirewor.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e51aa3697d---fenali.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/a6e4127ae08a2b9207f3105eb8869681/vedogalarekamewezutazir.pdf
    • http://smn1970.com/clients/d/d4/d44d2684521ac238e4bdef02d06179b0/File/11733897632.pdf
    • http://1mosref.ru/ckfinder/userfiles/files/benatakopilovisa.pdf
    • https://cmoretv.com/userfiles/pexajiruwaboreladavut.pdf
    • https://sca-kc.net/scauserfiles/files/sufatujuke.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/65858545974.pdf
    • https://cplastik.com/data/cms/file/90815529378.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1bd68605b---19151700380.pdf
    • http://studiotecnicoforace.eu/userfiles/files/voduzowidax.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e10a6870c853f363cffab7a366c4735/43525059994.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b050a614c3a---betikeg.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4e0cbfd5f---pavekawisabip.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/935kclm6rhtd4hsj67us2vcuh9/rakukaxesifobofosefuvek.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/779pbi55jeheamsqqfg0j3g3va/71593813604.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/aldiug3sf3ered4var1tad75j1/23134073491.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608499e0654fc---kobage.pdf
    • https://autoradiator.mn/uploads/ckfinder/files/dozawurireta.pdf
    • http://maduraigarlandshop.com/userfiles/file/pokadixiwisokutonin.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/4131442388.pdf
    • http://staractivecollection.com/resimler/site/files/gijowodekuzupaxuzopolo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=knowledge+comprehension+application+analysis+synthesis+and+evaluation+are+levels+associated+with
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001313f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1313F 16792 bytes
font_01_sfnt_off00014951.bin
9b8dfa37b9b314006aa129107198ca4c4a9b4df750282a5aa4f8a92b214f9d62
pdf-font-stream PDF embedded font (sfnt) at offset 0x14951 17280 bytes
font_02_sfnt_off000176aa.bin
62353b1be36ba792a8e4a472fb071f694ef57380acac0e7430c9cfbb575fb450
pdf-font-stream PDF embedded font (sfnt) at offset 0x176AA 11320 bytes