Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97fc885fd421d2c…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 09:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 584a895552bc8d82096bb519b105cc26 SHA-1: 2dbc5ccab2e6457746a6e7b65d674050db819d36 SHA-256: c97fc885fd421d2c67de7e65f97858cbd24e4b04000bc663ce33f1c946bd724f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=glass+wall+revit+family PDF link annotation
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16150f80629cde---49101745462.pdfIn PDF document text
    • http://puisan.ru/uploads/file/xenoxamafagubu.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/49455086635.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/26693410807.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/48921212944.pdfIn PDF document text
    • https://wrd13.com/force/file/61313336199.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/55a31dedabec4ba8fc11f146aab66ad7/25532775563.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/dapotidiwudejavub.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a70b80bc71---zefovadeturamadofowevet.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614778f004eeb---bedozifinikaxuxeri.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/jugura.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/73022090575.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021912537244849.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/82791705243.pdfIn PDF document text
    • http://katela.net/userData/board/file/kawebatosikowe.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/89544340705.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/tobajalizakuraxibonadosi.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/bijowogo.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/digelobivowem.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/90345828247.pdfIn PDF document text
    • http://wdnederland.nl/file/85598660740.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/85607515747.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///92952593114.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/cf660a8cd6eaf830b76f9b6c2f7672e5/65024339385.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/32141090434.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_off0000b0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CA 16524 bytes
SHA-256: d387622c179e1885d469e4d5039c9529cd68f7ae1a0bf61a7f938caaba5bf104
font_01_sfnt_off0000da97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 10456 bytes
SHA-256: 7375688c345407b52a588f2de586a686d1e5ac3a34d50501086d2e9b612255e9

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