Malicious PDF — malware analysis report

Static analysis result for SHA-256 9589242f2119d8b3…

MALICIOUS

PDF

80.8 KB Created: 2021-08-29 11:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f229f54e71e23c2d94a0809948e5d3f8 SHA-1: a207ef1ffae7f1a4e6f5d49cd561f4e914d3268b SHA-256: 9589242f2119d8b3da61e96b8bcccaf54376eab8893e1e304256794670aec686
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/c41fa1a94784091af4cd116002116903/segibunarapinugujirozu.pdf In PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4e66907fa---bukelijasene.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088503cd8435---85207497635.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/61435594433.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/123a30101192d3fa67483c4952c95e97/befebaxevokovifuretoja.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e53cbd5ed---lobiselifujarokatazen.pdfIn PDF document text
    • https://icbacademy.com/upload/files/xunupokud.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607813b5a42bc---68428240404.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/84988463104.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/4ljogdae972i2onur85km2dbeb/49676421573.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/d30f641632e97496cdad65e02e8b8d0a/17641969213.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/96110039830.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160903b21496bb---79417624764.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/hgbtqlmool0lgvies6143t2vo1/47491803322.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bcced0cddb0---kamon.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/6cfbb961c36cdd6e7bd81a7374dbf89b/wujutanovusurisuziv.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/29160695579.pdfIn PDF document text
    • http://zzquansu.cn/d/files/4927928118.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/1cac768af304991add2a15b8c50412d3/16093934550.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/79715581322.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/fufadixonijoramujofod.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/dceb16f49c1234fcceded3b0205819d8/gexupetixikalaj.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///gagokifuxuzanotezetusejob.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/gifawexipaxutodirawogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=difference+between+can+and+mayPDF 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_off0000d4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EF 10644 bytes
SHA-256: 0a93cb5e4600c364db3a1b469a4bdf69ab5b999e68953b5734e628c0612bb9ff
font_01_sfnt_off0000ed65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 18184 bytes
SHA-256: a9f4b4bbf0bbe79c136aae69f571816b8694b159ed14d80c2fb8d3be82b69305

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