Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee9ff19dc614b572…

MALICIOUS

PDF

87.1 KB Created: 2021-07-03 14:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: dd903fc6f3978a22365832ff9d500510 SHA-1: 9152d80f6890cf29ccc9c98603d5267da0dbf425 SHA-256: ee9ff19dc614b5729a714569531030dc94623224fba7cf6d55387c9c69e602d3
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to distribute malicious content or manipulate search engine results. The primary function appears to be redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://infrive.ru/uplcv?utm_term=how+to+write+apa+reference+without+author PDF link annotation
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9580d77351---lidejawexozekojoro.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c8b68d562---xozadubogokawolidid.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609792d47c6c3---doragoba.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/xedegijutenamiwigujav.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1620299746.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b805568f7---5595858109.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/rajobilogego.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5bc61fb98---kijojo.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966c2654f58---73087605304.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/qt99ng1vsbbo4nhnjt39mtc332/63731161256.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b3659a710964460c4c3f1e8bd7409f25/25714277128.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/3dedfd42093a66c0e0e41904910afd56/buwogo.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/gimaj.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/2178764915.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/fupemezijebulaxuda.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcdaa4dbe8---38888796938.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/23162260141.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/papavinulega.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607acea06d7ad---39723327766.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/44129380252.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/kerarawexixemejo.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/e075c592f6c6b6afe86036bcd8730ae1/rapodavosuvev.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_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 10540 bytes
SHA-256: e3b4924cfb0193b351bbd8f16412bbd7a898682469635d5fe266cdb9a05a98c3
font_01_sfnt_off000107a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB6 17440 bytes
SHA-256: ba15ded1d9a5cfd305f572d7501c09049b299757b593c5f033a0e92ea7e11c0e