Malicious PDF — malware analysis report

Static analysis result for SHA-256 355e45dba1ee0018…

MALICIOUS

PDF

89.8 KB Created: 2021-07-07 07:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ab00040282ee61966871b75cb1d843d SHA-1: d15aa81ab8d7cae7075e51c20605bdf5b25ecbfa SHA-256: 355e45dba1ee0018f5a75246541702a2cc24963f6616e26c93aed9c5148d27d0
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting, likely to lure users into downloading further malware or engaging in phishing activities. The presence of external URI heuristics and the compromised CMS upload link farm finding strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=python+requests+content+type
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/9a95178jq5u972lorcdum4q9ce/xeposaraxexisilumoraxat.pdf
    • http://sakaryakasaplarodasi.org/userfiles/file/sodumitexi.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/0b0e05e961caafaa0e779eadaf18cb0d/89594453118.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/dc73103c2745aa1961b45650db22acef/mofivofadi.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e6a2aa338013778b806cd9589b1d4c55/31451488143.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/9a658575b673fc7df25a46ab0a72b800/manovi.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad5cdac7b4---85794831126.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/9d976c8386622c0a1f8cb033ea4064f7/81389202651.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/xawax.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/e46amun7rh0m4u2fnpemu0skq6/73319283767.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160944e288db43---zuxajevomip.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b59ba48eae2---95228393174.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16090d7a952e3e---kanigamogikowejomemuvo.pdf
    • http://3e-machinery.ru/app/webroot/filesfiles/menum.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/khivg811e5fv7celap8hcrcu1l/lizewafotazesolodif.pdf
    • https://africanresearchcenter.com/userfiles/file/vafilolifadisiti.pdf
    • https://mamotato.ro/userfiles/file/25036898982.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b1eec897eda---35665829766.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b88c821014---mavulogeparukemu.pdf
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/selogom.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/bbsd9l5cibvrj3kpc3k21fdo16/71607314283.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/20177ad9728ff987506557c19c67ac76/guporupujezonezulotuf.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1a163ca74---86200459091.pdf
    • 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_off0000fa98.bin
740d7b8742b170a8e611be26b5908b4021702bfc2acfb748a95bf99ec1fa43eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA98 18168 bytes
font_01_sfnt_off00012a1c.bin
c1eb066c2452f3e33e45633898eb22749e95d143cef92f0a517c89ddeb57bc17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1C 10532 bytes
font_02_sfnt_off0001421b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1421B 16792 bytes

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