Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d346ba408682eb…

MALICIOUS

PDF

95.8 KB Created: 2021-06-25 23:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 65d00015172ed3bd37a55bf8446142b6 SHA-1: 6f81253aab6cf6620480569e57766c2dd09f0cd7 SHA-256: 13d346ba408682ebd8fffcc3aed1e0fbaac0d99be9e668a8de7efa89311e2e8a
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, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains, likely for phishing or malware distribution. The embedded URLs and the PDF structure suggest an attempt to exploit users by presenting them with deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://pistant.ru/uplcv?utm_term=the+incredibles+2004+torrent PDF link annotation
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/93e5b1e8800512cf65a5e6302cc46e28/supefomudajebiluvo.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b633be3b5ea---16826281130.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/59e76190bf232da718a84a0b76fee482/1563493337.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/42a8e29f033c3af80d527b314e8c67dd/62833230015.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/1688997655.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99368099f9---vibekirosokivujifuzezop.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160800fd38fdae---tefanivag.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca8f220b5b---91168498513.pdfIn PDF document text
    • http://firegallery.ru/img/upload/71981629066.pdfIn PDF document text
    • http://limoride.net/gallery/file/58453667840.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/dazaxoxelejapurakamog.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096cf1247891---77103912965.pdfIn PDF document text
    • http://calisnt.com/uploads/files/fukasedakaloxi.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/47bdb755876f6e121583653f4dfffd59/xavanigaguripubesego.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729f3163e8d---3571292620.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/54459c612b5f285057b57d9adb64e4c6/3344004069.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/75oc3b4nbnruvg9cjke1godc91/kutezunikanememunuzume.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/95579527240.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ab9a8b4ed---ragixenimarebizaregatutul.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/7a2e3c8443c8cf6784c597ec40e14277/51413232529.pdfIn PDF document text
    • https://roc.mn/uploads/files/joluselonilorevulexejo.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe8ec58e1c---gejezexenoxupalu.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9331a5b96---kubilaxobaxomavavibopovi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 19752 bytes
SHA-256: cd09458ba8ec8b2e502bcdc7c93dfe9372711f660d9bc6ecff224c442397b40b
font_01_sfnt_off00012bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D6 10728 bytes
SHA-256: 6f4348ab403dfe9b231bab57e20df0dd8ca542c9d46703ce953b3f2ec86e11bb
font_03_sfnt_off00015c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C6A 16060 bytes
SHA-256: 8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825

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