Malicious PDF — malware analysis report

Static analysis result for SHA-256 4348eddea6c2564c…

MALICIOUS

PDF

79.4 KB Created: 2021-09-04 22:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7e8def94e6924d844582dd65f30ce5d0 SHA-1: 9283c25cce8b6ccb4da068ddc84c47dec33a0113 SHA-256: 4348eddea6c2564c47af096ece2bc9b0c2e432aaad81596a1cfabc56b4a621e2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating 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 exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://archism.ru/uplcv?utm_term=pathophysiology+of+glaucoma+pdf PDF link annotation
    • https://windsbs.biz/files/file/6363138653.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/wekezufipege.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/5440737909.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f2c58f3b2---golidaburam.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/e3f49d788f50ae7ed796948b40f73723/lunizatuxafogizejuzefu.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/94b7f67927ccf5c6b1ce453f9de0006a/57358144516.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6073901036---16710804427.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/69804438139.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/joxamefavetamagilakenozo.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/33353424588.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac27d3a032f---nexafigalodo.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/kelefetesefurezagogenipun.pdfIn PDF document text
    • https://rcot.org/userfiles/file/32459859982.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//32498184332.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/54994554155.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/37382147213.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608117b331207---29131188801.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96634186925.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/wojujujixofanim.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b165ad5d640---27142328221.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/kemutunene.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb4d01c54b---83637911193.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_off0000d459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD459 10948 bytes
SHA-256: 8ea16a8fded2c6f6adb281246cb3c9ea973bc089887e7947b2ff9a85ebe3c4b7
font_01_sfnt_off0000ed97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED97 16568 bytes
SHA-256: 387f9172dadc367ff850876c752235a5f3c75b4f3aa24a4642c19a10aae7db03
font_02_sfnt_off00011870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11870 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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