Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a0319b6704f53b8…

MALICIOUS

PDF

96.7 KB Created: 2021-09-03 19:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5794c95688b80ff70bee5cae07e78752 SHA-1: 1ed2a99baccabef61959ecabd2098edad9959eab SHA-256: 2a0319b6704f53b83aba603b227683346e50436919cdc993cbaa491d7359d795
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common phishing or malware delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://laborke.ru/uplcv?utm_term=recommendation+letter+for+a+friend+sample+pdf PDF link annotation
    • https://menu2uplus.com/images/file/lovozexawogimox.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ce582f25f1---86608195481.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/mesoxelilo.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/ninijasexuduguzupevogala.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086555c22bef---56434041319.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/86889994011.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/pawuzokavasibezuke.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f16e09a7b---18798312869.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/wigomezurarasipajafu.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc26abfbc0---wobasinajujonaxet.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/ce3c3b2d399b0976355f5d8b19f7bb6b/zaparuvukogid.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/638a6c6cd0647dc8a41bb2dad563c422/77720553352.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d439586440---kukewira.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/9104435490.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7aa79468a8---texemarekobebinafowisut.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099136a742b7---21956456865.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/mubopadubutefezubotaz.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/72634053454.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/waxebenuxupewamepafof.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/roxisekatolubazawidapig.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/fajenozosodikesagotasefo.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/2db808ed540f5d65e83f1cfe8ecfbdd0/69669288790.pdfIn PDF document text
    • http://adveotec.com/img/file/titefofepadekajelalo.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e88195e44b---pebaxowufaxapaned.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/d73f75d289c17aecdc535dfa186aac5c/82820944994.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_off000115b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD0 10824 bytes
SHA-256: 57e8387d99b4525425fe8c3a898745d7a7975ac217d7ae2af09144559a424ff1
font_02_sfnt_off000146bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146BC 17804 bytes
SHA-256: ff34df2a5ccc66f0dcbbb64375820b556c62f71ab1b6896e8a015ef5fca86fb0

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