Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdbd86186922035e…

MALICIOUS

PDF

91.8 KB Created: 2021-06-26 23:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2574bc4745a45c132c090bcc2b5ffb66 SHA-1: 99673a1d0945793222adffe349392da558b4a22a SHA-256: cdbd86186922035e412d7c274e0b27f452559c3de3aee21aef8f20dbb451e939
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to distribute phishing content or redirect users to malicious sites. The presence of multiple links on disposable hosting and compromised CMS upload storage further indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/ck9agrkj7vpm59pi0721oa1d1c/xaxikazudedepasuw.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/6d86cecfa7de3cb15f228841230e06ba/zasarezimulokibozobotubif.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/42563f445e633d878d922baf967c4925/kazobogasiwivonudubuga.pdf
    • https://grandplaza.bg/uploads/assets/file/xazedisu.pdf
    • https://bhsbeacon.com/FCKeditor/file/josezoga.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606ead80416ef---92731699193.pdf
    • https://healthmatters.me/userfiles/file/bulid.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48a97e2bae---26819387352.pdf
    • https://bobecoingatlan.com/uploads/editor/file/26008742567.pdf
    • http://vantaibactrungnam.vn/upload/files/44571128738.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a970d46b263---puxir.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b875a8d1a97ef0bb533ff1d09456827b/26767238610.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6218d65b5---numedafijilosajo.pdf
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/roguwodebusivezodegirorax.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/cad39719c487e759eea249381852cde9/8279628959.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b491a423813---kupaxu.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607afef9e7f52---dudinaxalevi.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/e00a1b8d61eceabb27aad57cf01ae4a8/78710811361.pdf
    • http://birzebbugastpetersfc.com/files/file/guvunukiwamimeradezor.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c492fae0898---13352053751.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/cd354c65983b06488abc3d72e4548c6d/65318764904.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/28khgfhhu2a1954stdk91gg5c2/povuwajuvomesital.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec3c324c85---37278420776.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6090h4l61pdv0m9gv9jv17lgm/gijojenenagidojegibekon.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b3fab71cf---8788114643.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0qufd6vpurv9u8ko0hnblsl9e1/74599383079.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=bruce+lee+ab+workout
    • 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_off00010467.bin
596f45df27da08d0dd4482d0e6e58ea4fd3fe739cc15b2a49f78bc0308f0c2bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10467 17012 bytes
font_01_sfnt_off000130d2.bin
594eaa7e1f2fde053ff42b702e0aa41c24224e15ab3b2005ea939f339ef98f81
pdf-font-stream PDF embedded font (sfnt) at offset 0x130D2 10332 bytes
font_02_sfnt_off0001486c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1486C 16792 bytes