Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83bfda7d2a96dcb…

MALICIOUS

PDF

92.2 KB Created: 2021-08-31 18:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: acabe10c9c58ca60ff169b30626eab6a SHA-1: fd84c9fd88939ffcc3ef9eda2d0ab66f6ca0277e SHA-256: c83bfda7d2a96dcb785412cda97750573009c7ccc7ab2510ada8a53f492dc479
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous links pointing to compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm patterns indicates a likely intent to lead users to phishing pages or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://pixomot.ru/uplcv?utm_term=nose+is+burning+and+runny PDF link annotation
    • http://a1-automotivegroup.com/upload/files/wukonezixujurit.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2a5ae095---14444975222.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/22ba4155b6d3c04d971f5849671b63a1/66460592330.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/vinarovoweredugo.pdfIn PDF document text
    • http://salkim.com/userfiles/file/sajufuvijetulizovojun.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abee768fa0b---rovefajazusugufovasubu.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210708120832_e28btg.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/96048505950.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/1novuvaglfu7pcd26u1r6bf2j1/50912927582.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160e1057d4e2e0---93891496186.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/zadabibanafeser.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/28527493224.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/jobijofurezefumad.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082896b7722e---bigeganisojulipatanirofos.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/67620599559.pdfIn PDF document text
    • http://biosite.ru/images/news/file/zimofored.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/84439766969.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/jugepanutigudunosotodul.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/2adeccfbf883f2d279135221653f63c2/81717613203.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cba29eac4---denamijeja.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/dd7613747bcbb7582f53a2cfcc71d4f1/wolas.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/31b4dbffa092650a2a0c281cbb3b16f5/62545970195.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/fcfe270488a18dbc4d61222d94a77dbd/33566176236.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e842d7ff4b---49283920693.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_off0001021a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021A 18196 bytes
SHA-256: 97911e809fa6338531708b28e4fa738fd4da265ca9963132ac8cf4e841fcf41d
font_01_sfnt_off00013186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13186 10608 bytes
SHA-256: ccce0ceecebf4a6349d25342fb1ed47f676ce9e4098236cf6fef03735ab49240
font_02_sfnt_off000149b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1