Malicious PDF — malware analysis report

Static analysis result for SHA-256 c01e23903f6ef31a…

MALICIOUS

PDF

84.2 KB Created: 2021-06-26 02:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 89812c3a1ab39f703b9384684c9e7022 SHA-1: 387bd17680cc74aebfa869f002c2a2f08f680b1d SHA-256: c01e23903f6ef31ae8ac1bc715ecd43e73b6292db693b869e052c98b363d1a92
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised WordPress sites. The PDF likely uses JavaScript to execute malicious actions and the link farm serves as a redirection mechanism to further stages of the attack. The presence of embedded JavaScript suggests an attempt to download and execute additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • 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 http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087604abf439---37421078812.pdf In PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/8718861142.pdfIn PDF document text
    • http://asfalon.com/__files/file/danixulusenego.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210607130025.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/d91d5fdc1bef362ac37009394bcd1a18/dafulomefuked.pdfIn PDF document text
    • http://falerisztika.hu/tmp/zexow.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a7c7a231e---bunetokaxoba.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/aeba83a084b8a27379bf9cb7d73d2c94/fulumenovilos.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/29164486384.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210429041417107.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/daxixinufotimewut.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/70913460419.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/59973319843.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ab97730f7e3---neziwokagovez.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/p7bm9nsffmckjaicvmmlk4hfas/nudira.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607285f6e8a4b---10354021461.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/63559016343.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/xuxem.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/584ced3d2d5ca73710a10ee941136b21/gatapudosokukir.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/0ec5c6c3949774742db0a9ca778da0a5/59921188148.pdfIn PDF document text
    • https://wagaskar.com/media/kipufujupo.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607597eed4577---50424672164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=agape+for+todayPDF 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_off0000e387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB99 18956 bytes
SHA-256: 0030b8244c9439b534206b52a5420ffc9940df94c530841666d1c25be63e7088
font_02_sfnt_off00012ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA7 10356 bytes
SHA-256: 54a497228119edeb916b26bc0de332034f822a4d5c3e5d6f7bd64c57d7d62eef

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