Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a10c81c963a8f2a…

MALICIOUS

PDF

71.1 KB Created: 2021-09-29 02:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ef3c211c7c793b8abf799ba68ce8f77c SHA-1: 4469aaed1c87a0748a0bbe3a4ac64b699ca3a2f4 SHA-256: 8a10c81c963a8f2ac271c079bc43a35aa51c8683d67e846dd9d08f5f0b2e0e3d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://coretry.ru/uplcv?utm_term=crash+bash+for+android PDF link annotation
    • http://studiotecnicodambra.eu/userfiles/files/zepojitonaporugexok.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/sojakipolarun.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142d19d5f081---pomerelowobotumaku.pdfIn PDF document text
    • https://kingcom.edesign.fr/gr33/web/uploads/assets/file/34232539426.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/10806860501.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/zezez.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/32170083821.pdfIn PDF document text
    • http://boldogelet.hu/media/53741556271.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/324071597.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/xojifojedixawonekenus.pdfIn PDF document text
    • http://vhz.cz/user-files/76531232610.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161519e4acea94---damipusuwawozogadulexef.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/jelasenazuta.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-23/20210923071904204608.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/43783746863.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/60394959372.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416a6ad1fe7---91405873310.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/tajubibije.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/miruxusimedada.pdfIn PDF document text
    • https://nevisnews.com/userfiles/powuditolovoruvug.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/40438349009.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/54650349754.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/gezufekumofiwusujibager.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/62986028899.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_off0000b44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB44D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5F 17020 bytes
SHA-256: 0904dce36a5f94326c8330390c0a33614f246cf94ece84e158278e0a433881c2
font_02_sfnt_off0000f7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AE 10344 bytes
SHA-256: 0bf7eb2a00cedcf5f60d782006a83b00d1f361c6255da2539fd787c3888993da

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