Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec077b4005c140d2…

MALICIOUS

PDF

88.2 KB Created: 2021-09-06 12:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5930f45366684520f0ba7f1b81e51de9 SHA-1: f014cebaed285abc01567e0a3ff6e9345f2c0990 SHA-256: ec077b4005c140d2438476420af3f11286a147a5c8cb09131dbcdeb3bfcc5126
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure suggests it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://markmont.eu/editor_uploads/system/files/20081096218.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee3d6bc283---35631775429.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b76d64e59---migarilowuposadit.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/84338644496.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/19753308410.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/eb6a6b9835b4ec43970bbea9efedd0c5/61590322318.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/kixomaxuwapironulamar.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/xebipemuwubiwofapumokize.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/41036120191.pdfIn PDF document text
    • http://pnalog.ru/images/file/zizivifetoxikas.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/rogavenogilobobetidu.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210609_04A38AD0041CD279.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/vosiwixupi.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a3d805ce4---merisidukolusezawi.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/kabonikux.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/15620020875.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/dabajuwomupujikej.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/7f5ec6732a8ef7db31dd364dfeb272db/72531271386.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/penisa.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/mexularamiperijofazuleb.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/0277bc40a84af93cd691521b5d9766cf/pitimibaba.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750d9f5213d---xoloxikexukagaroso.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/56880944174.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/91927426087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=non+negative+measurable+function+pdfPDF 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_off0000f06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06F 18644 bytes
SHA-256: cd4f6c358fada40ca37d1dbdc5f8ff82d7af70ba75cc3e68443e1b2ff7d6f161
font_01_sfnt_off000120f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001390c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390C 11244 bytes
SHA-256: 425e6ea85be8be9bb2368fb638391eb07f6e0ec058c2a5c4a0a0de4b2b94413a