Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3bbccaa923bb6ae…

MALICIOUS

PDF

89.0 KB Created: 2021-07-13 07:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4d6c71358b94d1b7559713bb5ff7e6a9 SHA-1: 9c5005175ba40c791f6b8df167aa588d49993565 SHA-256: c3bbccaa923bb6ae9830aedd12cd05d32231ed38fd40d4560b9e407d11419776
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further malicious content or phish users. The presence of multiple external URIs and link farm characteristics strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://cissud.eu/uploads/ck_editor/files/dolinujotowowepadenu.pdf In PDF document text
    • http://hodori247.com/uploads/files/70917365870.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/guzuxozo.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210531025937.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986d766c621---gugexevujerefunajeluzit.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/65439675891.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/abc72dd270ca931e33d77d86de7488fd/gufexemoxerurutemeduriw.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd57279eef---65386970807.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6b14c0fef---ruwaxali.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/3159544629.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/93991213402.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc6236e12f---53377884956.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/752fff2d42df58f5da4a41c81e73f3c3/18427122434.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/12604301863.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/mikex.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eccb5595246---32916604309.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6fc0ed94b---87807915800.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd74debb671---11541052450.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/66321260623.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/54761005336.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ed444e59f---lelozufebowasu.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160708ef4c4b9a---rajanuvuxizoxoxajo.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/53954465354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=take+me+home+fingerstylePDF 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_off0000f5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A7 18764 bytes
SHA-256: 566bb1f356c86fbf561f502fe9e146ad9a7e651f013c72481cbb764b32381135
font_01_sfnt_off0001267c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E93 10832 bytes
SHA-256: 67b1f2590a2a2a11470c4f22df543335957af936203bf931dadc836b68bc17a4

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