Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21782d7fd643866…

MALICIOUS

PDF

93.9 KB Created: 2021-08-15 03:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 482616f2dbc793118e540bd97d7426e6 SHA-1: c154e03d8095f9b7f4e6a1fb885fcb67c240c72c SHA-256: a21782d7fd6438664ff2c6283600ff3158286431b267ef82a0ab406b9b12ee39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://garglob.ru/uplcv?utm_term=ver+pelicula+pasion+por+el+triunfo+1+completa+en+espa%C3%B1ol PDF link annotation
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/15ef0221cb711360792edf1aed757c61/1588074656.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/21761022673.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082b5bd37ff9---70121800151.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/pevipuzujevozajobon.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/8494772405.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/18b65nlppst7urkbrhget9afr6/zotowetedozipufukotafubo.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/1modp4imrejcklu06buedp8iaj/rajupomule.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc8b3db653---63410576737.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e5e647b21---13526028791.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/64157814817.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ff0143a51f8---jipijozim.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2183374b7---23507477652.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160dd86200693c---vosapu.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8467a1f2a---33653659981.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/vinuzasumobubegejebile.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/xonadogep.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/d7193490986f4880f581da987bfcf6c5/69607007569.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///bitinokekogedojadorufo.pdfIn PDF document text
    • https://majubesar.org/contents//files/46870712041.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6c266064c9f25f72cd48a1162f361a31/456532703.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/1c2f73d37ff61e7838cdf7ed9759155d/64893503912.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/madugovisasafefonufozup.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/lowigi.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac69315749---19487785595.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/moromoxulud.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BB 10968 bytes
SHA-256: eaae1c8284ca4a168efa82ea590897dbbe9fc581298c746d53cd7dac793670a9
font_01_sfnt_off000100f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F1 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
font_02_sfnt_off00010920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10920 16192 bytes
SHA-256: 97e3f73a58ccdd4784c9ae1678d9f90717e6b6d0c87c36bf93adb8865ef65ebd
font_03_sfnt_off00011eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000136be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BE 17976 bytes
SHA-256: 1be2519c81a28cc09a1626e6b97a5dd3dbbdc4ed8fab59fb28c3eb2f989851e1

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