Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da4748946747511…

MALICIOUS

PDF

71.0 KB Created: 2021-09-21 11:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c021a7e945857b052a8a285482962cbf SHA-1: e33279d22194a083f90892e91190977f34757918 SHA-256: 8da47489467475112e5806e9c3b5b84093cc86bfb8c4be7802e55493f9464c02
196 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs users to open a password-protected archive, a common tactic to bypass gateway security. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://chcial.ru/uplcv?utm_term=qb+books+online+login PDF link annotation
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/34bf40e509a550ea793f2f0d317f79a9/migafokesiwujizomalufik.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/zuximevuwodigorofazasijo.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/sipevuv.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b97e5af0b---82006776702.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/11159512626.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/dudamotaxos.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/48029981874.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/92666560684.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/mufuminefedukomifuvepar.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/bexexagojabovemibalotad.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/11291555638.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161495defe667f---84633740203.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1631363252.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/rigidose.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/joges.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/zezumemesodetoros.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/88023197537.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/12432939739.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/66256477284.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/97535345133.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/52783884771.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/xixutudi.pdfIn PDF document text
    • http://hidramaco.com/files/files/68386132437.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_off0000b5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A9 10216 bytes
SHA-256: 1fb9436a98c711deaa344c5288bf40c83a606a062374f7433cf294751292450f
font_01_sfnt_off0000ccba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBA 16292 bytes
SHA-256: 2f88f3a9177245163dd9d6434cbaf6fda74f98e5fc192d76ca41fa54feb1319b
font_02_sfnt_off0000f69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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