Malicious PDF — malware analysis report

Static analysis result for SHA-256 3759a048fa92fb40…

MALICIOUS

PDF

151.4 KB Created: 2021-07-29 18:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6de5ea56e4880c10ded7a91023c3e708 SHA-1: 0467645b9b7b6680544d0db8931b6122050aabc3 SHA-256: 3759a048fa92fb40a6a048741eb9e37f441298dba20285627f681f5a616627e7
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://rld-carbon.ru/file/15817124786.pdf In PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/6hn5bqqcc2v3vpthrtidckqh47/waluzoxijenijosevijokamum.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/kutabupopupixujuzaxena.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1acd0ef57---58239038640.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/tojagajaxaselu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b738ac0a29---lajezowikenimuxuj.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/zuseriwifomijexux.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/konukezab.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710f633ebd5---xifiti.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf167655ab---33853860981.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/50187074331.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/weledawezijunogitikamexor.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/gevodatolulo.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202107140706189286.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/a4b5f849a51e74e80691aeb190062b71/16793868457.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba045b258cf---2369905060.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abde5f1b2c7---mononokiwidusefafuboxinu.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/83481343536.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/19f0d4c459afde93be78615a41078a8e/tisunedanesezeri.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ba35160f1---13056897685.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160799f6f0a787---tokowubekumorir.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/3924d212276f23a944abf334f6c60180/93482205857.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/c10d0844a2b8e9cc83fb2e88ba9ba1d5/61356687446.pdfIn PDF document text
    • https://krossi.ru/images/content/files/62939872320.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/e67d806712c7edab4ccfd8b071ec347f/22072310625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=castle+rock+lake+wi+fishing+reportPDF 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_off0001ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED92 18124 bytes
SHA-256: 0186e41f3bbffc49e66372a19bb09902cd90d77c1201cdd486ed059e802febbf
font_01_sfnt_off00021dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21DBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000235d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x235D4 10968 bytes
SHA-256: 8fbb8ae1699b972c1630b3914cca4836c7a78ccd80ff88be792f4157cd855ee5

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