Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa252ca95e01822…

MALICIOUS

PDF

102.5 KB Created: 2021-06-28 20:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: db35cb8fd5f1cbbf0248269c9c6c5f54 SHA-1: 4403ad3e561f21719816724c1539e3fb98fbb729 SHA-256: 3fa252ca95e01822e33d1c47fc548936cd58e36a32419aee856701f3e98372b9
156 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. It contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The presence of these links suggests an attempt to redirect users to malicious content or phishing pages, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://inwebjor.ru/uplcv?utm_term=baked+haddock+400+degrees PDF link annotation
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608222b5456ef---donerog.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/015dc0fa5df6007e4b580759440c049a/xotipizukosemoros.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/diwofupesigomebibubelesom.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea155a512e---notawabajadegefeguvixetoj.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/41c6a5685bd441f94f74dd23073f75ac/32884994194.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/29341774720.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/39533603147.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/65376050849.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e492def916---28950735064.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/98672117960b8eb0a353be.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/e12a608c6cfe67043e311c0fa5717e5b/37373175567.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/62658352566.pdfIn PDF document text
    • http://turnyras.lt/Files/file/53524195276.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099de058df69---98738740614.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/mp29q868t2vfs066kgap1nqb45/lonufuneg.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/b6608e5f0cc73106023af1ffeecb8288/tixuwegariwanuwoxogilezu.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/f13fa284c168ff398d5e88c83a69f26b/sudebu.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/nphuuic44i20lgpkj6q4staa6u/jejiji.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad791cd82c---kewopegez.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d34bf37051b16318a4436d7c867ac994/jolesibanufepogego.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608adb714f3d2---tatulubegoxamodis.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e84dc6d603---64284786048.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607441dfb5dc6---bubabifiku.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/03e30f618dab4d8d8d8ca21bce8b0116/79948937286.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/8367ae2ecbf8a6a289a741b84ae1a926/laxalelasupuzasubuv.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_off00012a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14227 10652 bytes
SHA-256: f3166eb08d5631198d4d37ab4ae2cc518cd64f1eb5afc6d2a9eebe6940bcea32
font_02_sfnt_off00015a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A83 19668 bytes
SHA-256: 9bcd36b345a139814cd76c3f392c5979c48eaf2aac438baab2eec3a7c1d0e1aa