Malicious PDF — malware analysis report

Static analysis result for SHA-256 f59ee1e81fcb1a30…

MALICIOUS

PDF

127.3 KB Created: 2021-08-03 05:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 40f8d1241ed1e6931643375cdfdc8f7e SHA-1: 80f6c3d42c671031e41c03561c58cd2834fae3cd SHA-256: f59ee1e81fcb1a30ef08d993cee3fc1152def58b354149d9b6aef35b8a9c6e1e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users through a link farm. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=recapitulation+theory+of+play+%E6%84%8F%E6%80%9D PDF link annotation
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095db9f253eb---dumuniwawiberuxodad.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/70582570037.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081c93787e7f---17646360154.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/77433210616.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/sonaxigolebo.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/lijusewebikulaviwofojojav.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/29864190006.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/xowepuneke.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/18122736942.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940128dd811---robix.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/63368948299.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/sirelubotago.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/fdb2e59d8e604315f6be11f0b44f9062/77118890019.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/20761656960def56e46cef.pdfIn PDF document text
    • http://envigest.cz/upload/file/38746904165.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/ba96b27e6a57797bc092a76549594460/47000479587.pdfIn PDF document text
    • http://tuccifamilyonline.com/clients/b/b5/b5aed9f4ae8fd2b300021b46b426cae6/File/61935875894.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/jkr55ac4gfec3qvqvvv6osfndv/47316692510.pdfIn PDF document text
    • http://salt17.com/userfiles/files/vakiwedovof.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/2820453123.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed964835b2---76729633337.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cd942e95a---88988748004.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
stream_006_off00010f89.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10F89 49540 bytes
SHA-256: 7d2407ad4c046810610be21ca26573dbee6df814a230292ae5c1b8303cc34864
font_01_sfnt_off00019099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8B0 10668 bytes
SHA-256: 49b05d60693b90b7792cf507f014fe7c6486b456b26a6a160b924e950f82183b
font_03_sfnt_off0001c113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C113 16468 bytes
SHA-256: b01e972a9a48414bc14d28595a41df5a6344189b3c51078b53a273e6e022f80b

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