Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68a5eb7b72306a1…

MALICIOUS

PDF

76.1 KB Created: 2021-09-05 04:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f822ce8b9ff292e84d67168602a281a0 SHA-1: 571b39ac02f14b67afe57601d8be7d8f81a3a738 SHA-256: d68a5eb7b72306a15b79b3f63bfb7a1e0fa15f02e0eb974547b626aa870ac323
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting domains, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pistant.ru/uplcv?utm_term=degrees+of+comparison+of+adjectives+worksheets+for+grade+5 PDF link annotation
    • http://veterinariogiardinelli.it/userfiles/files/72031307827.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/18d3d31b7fbc202a530518710e25eab5/61721318991.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/f95r54v2nsbag8fevc306q8iks/20744923799.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/96366969653.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/74010481893.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/11043280349.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/43839794583.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a61a0cdfecc0892703a49bc493ed9c27/62906693512.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db5ecb9e722---40977759022.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/natobari.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/bijiworofotefafewib.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/18626576527.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/14455601031.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f5749a763---rogenusen.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/rotosute.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abe8b81f150---26200616780.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/kowuboxedutepafovibopofo.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/5503232190.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/1ql6pni98m4hktbvgmo03751oi/46983701351.pdfIn PDF document text
    • https://soechi.id/userfiles/file/zajebokuvowukomixikexasu.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/a4tohobtbvnh0jehgng6i6r075/gidulixikikusi.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/majebuno.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a38cff4fa55---71568072850.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_off0000c1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F7 11528 bytes
SHA-256: cdc3a370e9d4b4f496e2a082e436d863a640ffcc948e732c6719bcbf2dfa7749
font_01_sfnt_off0000dcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF9 17640 bytes
SHA-256: 172fb113dd61f732c67814a575a3d2929ba5597d9f976b8fd3f65e63b07e0f43
font_02_sfnt_off00010a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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