Malicious PDF — malware analysis report

Static analysis result for SHA-256 2078cb1c153ca441…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 00:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 33b8a73a6f7ca7ebe284c6c0fb6c53fe SHA-1: d73ca7f121f0eb939793a1f8d585650584318436 SHA-256: 2078cb1c153ca4413722138e686498b07b24b659061955bcf888e7ec7910e9bf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware distribution. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The primary function appears to be redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=ejercicios+de+monosemia+polisemia+y+homonimia+pdf PDF link annotation
    • https://aldurra.ly/images-editeur/img/file/49380725847.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/89442689659.pdfIn PDF document text
    • https://masihpt1.com/contents//files/39261834652.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161160fbb178b9---mosatajolo.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611dcbb682ffd---vodusinevozitaxazema.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/25693767416.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/76684385343.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/8087668719.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/ad67f846012bcc67eb6a92a82e22e360/zonudazot.pdfIn PDF document text
    • http://ymmicro.com/files/files/gomekasuzuzadoxufuko.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/bh6d0b601tdojgdtt5qauogt0d/55593075288.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16226219834025.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210903182917.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f8ff63c17a5442a64ac57c3bb580d5b2/42227460367.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/pavelubupadobetanapizata.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/33069303398.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/pixaluwufukajanitejaxoj.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/253bf33ab2a6f85a58d88d2e3a4eb99e/98259672907.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/7uj4r1vbt8vnrmuv003b39p1gt/22968377567.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/buwixujekanagegiru.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773f54d271f---videtivi.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/satanufekawegowovebawisu.pdfIn PDF document text
    • http://sbkf.org/files/files/bexoza.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_off0000dcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAC 19920 bytes
SHA-256: 5a009d9437f870c7d73fb6021660c18c05ca8d96527735be1382d457050854a3
font_01_sfnt_off00010f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12725 11012 bytes
SHA-256: 847d38edbc5e627baaeb517f2f4fe59fe7ecb54a101d4cfaff63a934b12c438b

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